- Warner Bros. announced earlier that it had abandoned the project for the film, but a week later the director Ferrari Brothers found a new owner, Universal Pictures.
- Kim Carey has never been too cold about the plan to shoot the sequel, and in 2012 he also announced his withdrawal from the plan.
- Shinco's Oscar actress Jennifer Lawrence has a cameo appearance in the film, playing a woman who works for a tractor company. He is the dream lover of Dumb and Gua in "Dumb and Gua" 20 years ago. Due to the role of the drama Not much so the shooting ended in one day.
- Since the film tells the story of two brainless fools, it contrasts with Scarlett Johansson's film "Superbody", which explores the potential of human brains. Therefore, the character posters released in this film deliberately imitate the "Superbody". Poster style, the original advertising slogan "Everyone uses an average of 10% of the brainpower, imagine what she can do at 100%" to "Everyone uses an average of 10% of the brainpower, imagine that he can do it with only 1% What", it makes people smile.
- In order to promote the film, Kim Carrey also hosted the long-lasting show "Saturday Night Show", during which not only did he review all his classic roles, but Jeff Daniels also appeared to join him in the form of Harry.
Dumb and Dumber to behind the scenes gags
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Harry Dunne: Mr. Stainer, Mrs. Stainer so nice to see you.
Mr. Stainer: Harry, Lloyd. To what do we the owe the honor at this late hour, gentlemen?
Lloyd Christmas: We were just wondering if Pee Stain wanted to come out for some suds and maybe having his ass handed to him in a couple of games of Dig Dug.
Mr. Stainer: Lloyd. Peter is dead.
Lloyd Christmas: Yeah right. Since when?
Mr. Stainer: Since 1991. Remember?
Lloyd Christmas: The motorcycle accident? But I thought he pulled through. The obituary said he was survived by his parents.
Mr. Stainer: No, he did not pull through.
Lloyd Christmas: Are you sure?
Mr. Stainer: Yes.
[Shows the duo a poster of their late son]
Lloyd Christmas: You guys are right. Anyway sorry about that whole thing. Pee Stain and I were close friends.
Mr. Stainer: Yeah, we know. You were the one who sold him the motorcycle.
Lloyd Christmas: And if I recall I made him a sweet deal. My bike for his helmet straight up. That thing was a rocket. A little squirrelly on the corners, and when you got on it straight away...
Mr. Stainer: Good night, Lloyd. Good night, Harry.
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Harry Dunne: Let me ask you something Freida. If I'm not Penny's father and Lloyd's not her father then who's her father?
Fraida Felcher: Funny you should ask.
[to Penny]
Fraida Felcher: Honey how would uou like to meet some relatives?
[Points towards the Stainers]
Lloyd Christmas: Mr Stainer? I should have known. You horny old goat!
Fraida Felcher: No Lloyd. Mr Stainer is Penny's grandfather.
Harry Dunne: You mean Pee Stain's the dad?
Lloyd Christmas: Duh!