Eddy is busy practicing his shaving when Ed comes in with a bunch of stuff. Eddy states that Ed doesn't see that he's practicing for manhood. Ed takes the shaver and puts it on his bed. Ed gets Eddy's doll, Eddo, and brings it as well. Then he gets numerous things from Eddy's room. Eddy chases Ed outside and tells him to give back his stuff, and then he notices a box with a note saying, "place memories here." Edd comes in and says that he is late for the time capsule project he is planning out. Edd then pulls out a Canadian squirt gun. Eddy of course remembers it and squirts Ed in the face. Then Edd gets out the hypnotizing wheel. Eddy asks if they remember the time they hypnotized Kevin into a chimp. Ed states that Kevin thought his butt was a peanut before Eddy bites on it. Nazz comes along but then leaves.
Eddy asks what they have in store. Ed then comes out dressed as a fad freaker. Edd then gets out the part from the time machine scam. Then a flashback begins.
Jimmy and Jonny are in the time capsule listening to Edd's lecture about time travel. Then they go "back in time" to the triassic period. Jimmy sees a fake dinosaur, and Ed launches another fake dinosaur into the other one's mouth. Edd was driving the fake dinosaur, and Eddy bangs on the column causing it to come tumbling down.
The flashback ends and Eddy gets out a pitcher. He says it's from when Edd had the hiccups for two days. This begins another flashback.
The Eds try numerous times to get rid of Edd's hiccups. First Eddy pops a paper bag Double D was using, but it turns out they're still in him. Then Eddy pours water down his throat but it still doesn't work as the flashback ends.
Ed pulls out a spatula and yet another flashback begins.
The Eds are making the world's biggest pancake in this flashback. Edd points out that the kids have mistaken the oil for a skating rink. Eddy yells at them to get off, but Ed pours the batter onto the kids. Eddy gets pulled under and gets beaten up as the flashback ends. Eddy claims that Ed made that up, but Ed refuses to believe him.
Eddy then whallops Ed with a fish. Edd then asks if he remembers that fish was used to duel with Rolf, but Eddy then chases him to make Edd and Ed stop remembering. Ed then points out the ice pack was when the Eds destroyed Jonny's house. Eddy is furious now, and he wants them to quit breaking up the past. He chases the remaining two around the yard as the episode fades out.
Eddy: [face covered in scratches as he's "shaving" with a disposable razor] "Ed! Can't you see I'm practicing for manurity?!"
Edd: "I wonder what Nazz will remember of us when she's older?" Eddy: "That you looked like an idiot and how could she've let a hunk like me get away." [Edd snickers and walks back to the capsule]
Jonny: [inside the dinosaur with Plank] "Neato! We've been swallowed alive, buddy!" [sees Edd inside the dinosaur] Edd: [Nervously] "Well, uh, hello, Jonny." [loud thumping from outside the dinosaur by Eddy]
Eddy: [after hitting Ed with the fish he used to duel Rolf] "I hate clip shows!" Edd: [Shocked] "Eddy! You stop right there, mister!" [puts ice pack on Ed's head] "Remember when you used that fish to duel with Rolf?"
Ed: [grabs Edd and opens his mouth, yells to Edd's 'hiccups'] "I am a zombie and I will malice you with a shoehorn!" Edd: [hiccups away from Ed and lands on Eddy, panicking] "Malice me with a shoehorn?!" [hiccups twice all around the room with head breaking through floor]
Eddy: [not believing the time machine] "What are you talking about?" Ed: [somewhat agreeing with Eddy] "Yeah, Double D. An elephant never forgets. But I forget what the elephant remembered." Edd: "You probably just weren't paying attention at time Ed, but I'm sure Eddy remembers." Eddy: [holding a jug] "In an another life, windbag."
[in a flashback, Edd with the hiccups is blowing into a paper bag] Edd: "Hiccup! [Eddy sharpens one of his three hairs with his teeth] Oh my." [Eddy stabs the bag with his sharp hair and sends Edd flying back into a wall] Eddy: [Ed's head appears on-screen next to Edd] "There, they're gone." Ed: "Hiccups have left the building, Eddy." Edd: "Hiccup!" [extension switches pop out of the wall] Eddy: "Strong hiccups." Ed: [carries Edd over to Eddy] "Quick Eddy do something! Double D is gonna-!" Edd: "Hiccup!" Ed: "-explode!" [puts Eddy on Double D and then sits on Eddy covering his ears] Eddy: "Ed, you idiot, this ain't gonna get rid of the hiccups!" Edd: "Hiccup!" [Ed flies into the ceiling and Eddy bounces off Edd] Eddy: "Ow."
Ed thought that the icebag that Edd put on him was from "Rent-a-Ed" where he mentioned that the Eds destroyed Jonny's house, while in reality, it was from "Flea-Bitten Ed" where it was used to try to get rid of Ed's purple hives.
When Edd reminded Eddy of the fish he used to duel Rolf, you can tell it was shown in a different color, rather than the color it was in "Dueling Eds."
Fourth Wall Breaks: Ed breaks the fourth wall when he is describing the Canadian Squirt Gun by saying "As though it were only second season", since the Canadian Squirt Gun was in the season two episode "Know it All Ed." Also, Eddy breaks the fourth wall by saying "I hate clip shows!"
When Ed knocked Edd and Eddy to the ground, they didn't hit the ground until Ed finished his sentence.
If the flashbacks, Ed's Time Travel Service, the unstoppable hiccups and the giant pancake actually exist, it is implied largely by each one that the respective forgetful Eds have forgotten because of being banged up even more than they are usually.
None of the flashbacks aside from the last one appear in other episodes prior or after this episode.
However, unlike most clip shows, this particular episode does not play scenes from any past episodes shown prior to this episode.
When Ed is in Eddy's flashback trying to scare Edd's hiccups away, he says "I am a zombie, and I'll malice you with a shoehorn!" However, malice is a noun, meaning Ed should have said "I will cause malice," or something to that level. However, let's not forget that this is Ed speaking here, so he often makes a few errors with some words.
The Eds and Nazz are the only people to appear outside of flashbacks in this episode while the kids only appear inside the flashbacks.
"Dueling Eds" is the only episode from the third season that was recalled. The others were from the first and second seasons.
Edd recalls when Eddy used his fish to duel with Rolf in the third season episode "Dueling Eds." It seems that Eddy has learned how to use it properly by this time, as he hit Ed square on the head with it and he chased his friends around with it towards the end of the episode, while in "Dueling Eds" he seemed to have no clue how to use it.
Even though Edd said the Tyrannosaurus didn't live in the Triassic, none of the species seen had evolved yet (except the Pterosaur). The Alamosaurus and Triceratops appeared in the Late Mesozoic era along with the Tyrannosaurus and the Pterosaur was the only creature that was not a dinosaur and appeared during the Triassic during the Early Mesozoic era. In addition, there was a sign seen saying that no mammals were allowed, but mammals had evolved by the start of the Mesozoic.
When Jonny is riding the Triceratops, he exclaims "Twenty-Three Skidoo!", a cry yelled by early twentieth-century policemen when gusts of wind near the Flatiron Building on 23rd Street in New York (hence the name), blew up women's skirts, revealing their legs (which were seldom seen at the time).
This is the second episode in which a dinosaur-related scam has been seen. The first was in "An Ed Too Many."