Stupidity: The train which takes M from New York to London arrives looking like an old tube train, then when she's on board converts into a high-tech train, to her amazement, and whisks her across the Atlantic. Except...why did it ever look like a regular train? She's in a MIB station, it's only used by agents and aliens, it goes to another MIB station, and when it arrives and people get off / on before it continues its journey, it stays in its high-tech form anyway.
Men in Black: International (2019)
1 stupidity
Directed by: F. Gary Gray
Starring: Liam Neeson, Chris Hemsworth, Rebecca Ferguson, Tessa Thompson
Continuity mistake: In the first movie, it is stated that the program was started in the '50s, but in this one it is stated that Gustave Eiffel was an MIB agent. He died in 1923.
Agent High T: Always remember: the universe has a way of leading you to where you're supposed to be, at the moment you're supposed to be there.
Trivia: Early in pre-production, the film was going to be a humorous crossover between the "Men in Black" and "21 Jump Street" film franchises, featuring Channing Tatum and Jonah Hill having to go undercover in MIB. The working title was "MIB - 23." The idea was dropped, presumably due to its outlandishness.