Harsher in Hindsight: Tiny the T. rex mentioned that its species have little arms. Not so funny when this happened to Rexie in Jurassic World when the I. rex uses its longer arms to its advantage against her and nearly killing the beloved dinosaur from Jurassic Park.
Bowler Hat Guy must not be a fan of Frozen, as he advises Goob "DON'T let it go." Becomes more hilarious when you find out the voice of Bowler Hat Guy also voices Kai (one of the royal family's servants) in Frozen.
Bowler Hat Guy's unicorn binder was probably meant to show that he never grew up emotionally, but as of 2010 he could be identified as a brony. The fact that several other people, all of them male, compliment him on how cool his binder is just reinforces this interpretation.
"I have a big head and little arms!" Explanation A "line" uttered by the T. Rex Bowler Hat Guy plucked from the past when it can't get at Lewis. Upon Bowler Hat Guy chastising it for not seizing the boy, it leads off explaining why this isn't working with the line you see. The line caught on almost immediately thanks to how silly the declaration is, considering what's saying it and how it's basically kind of cursing its own anatomy.
"They all hated me." Explanation (Spoilers!) During Bowler Hat Guy's/Goob's explanation of how Lewis ruined his life, he says this line... right after a scene showing several students happily showing interesting in being friends with a younger Goob, providing a hilarious contrast with the narration as Bowler Hat Guy tries to paint his life as being utterly miserable.
"That is an excellent question." Explanation A phrase that Wilbur uses no less than four times over the course of the movie (if you're willing to count his declaration of "Another excellent question!" as he's running to the transport tube), to the point where you'd think it was his Catch-Phrase.
"Mr. Steak, you're my only friend." Explanation Not long after Goob returns to the orphanage with a black eye from his baseball team and meeting the Bowler Hat Guy, Goob says this line while hugging the steak he's using to soothe his eye like a security blanket. This line often gets some use for more Woobie-type characters.
Moral Event Horizon: Doris gets one when she brutally murders Carl in order to steal the memory machine back. This foreshadows what happens to the future as a result of her and Bowler Hat Guy changing it very well. Fortunately both of these events get an in-universe Ret Gone.
No Yay: People pair Wilbur and Lewis. The weird time traveling incest doesn't put them off.
One-Scene Wonder: Cornelius/Future!Lewis. He appears only in one of the last scenes in the movie, but he certainly makes his screen time leave an impact for what time he does have.
The Problem with Licensed Games: Averted with the home console version, which is a rather good action adventure game that is a prequel to the movie, and the Nintendo DS version, which is a third-person shooter with a simplified version of the console game's plot that's pretty fun but got flack for its short length. Played straight with the Game Boy Advance version, which is a mediocre game that switches between side-scrolling action stages and top-down puzzle-oriented stages.
Rewatch Bonus: At the science fair, Wilbur knocks over a box full of frogs and their owner makes him pick them all up. He isn't too pleased, calls her "annoying little girl", and she warns him: "I know karate". It's hilarious on later viewings when you realize the little girl is Franny in the past, Wilbur was calling his Mom an annoying little girl, and yes, she really does know karate.
Squick: Ummm... well, at one point Lewis is almost adopted by his future wife!And he calls her "Mom"...
They Wasted a Perfectly Good Character: A whole family's worth; each of the Robinsons gets just enough screentime to see their persona, but not enough to really flesh them out. Mr. Enter compared it to a television pilot introducing characters with the assurance that they would get fleshed out in future episodes.
Trailer Joke Decay: Subverted. While Tiny's line "I have a big head and little arms!" was spammed constantly throughout the film's advertising, the gag stuck with a lot of people regardless.
Win Back the Crowd: After an abysmal five years, which included closing its legendary traditional animation unit, making a terrible first impression on the All-CGI Cartoon market and very nearly losing Pixar, Disney (and a little change in management. Thanks, John Lasseter!) proved to its fans that they were still capable of making good movies.