In Iron Man (2008), you can see the energy moving from the arc reactor in his chest to his repulser.
In Deadpool 2, Yukio and Negasonic's cup says "I'm with her" with arrows pointing towards each other.
In the 2019 Hellboy movie, in one scene Hellboy’s hand changes from right to left and back again. He was probably facing the wrong way for that split moment so they flipped the video, hoping no one would notice. A lot of movies actually do this and people always notice.
In Avengers: Endgame, in New Asgard, they brew Asgardian Ale.
25Kill Bill vol.1
In Kill Bill vol.1, O-Ren Ishii warns The Bride she might not last five minutes in a fight. She loses the duel, in a fight sequence that lasts exactly 4 minutes and 59 seconds.
In Inside Out (2015), Riley is seen wearing rainbow t-shirts with colors for each emotion. After the move, she wears a yellow jacket, symbolizing the other emotions being suppressed as she tries to force joy in her life. Later, Riley wears a black sweater for her complete inability to feel anything.
In Clue (1985), each character's car is the same color as their name and game piece in the board game.
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15 Most Controversial & Costly Blunders in History
28Spider-Man: Into the Spiderverse
In Spider-Man: Into the Spiderverse, right after the first Spider-Man says “For 10 years I have been the one and only Spider-Man” there is a sign in the background telling us that he is “wrong”.
In Osmosis Jones (2001), Tom Colonic twists the head of the kid in his commercial. Next time we see him, he's in a neck brace.
In Avengers Endgame (2019), when War Machine says "Canopy, canopy, canopy" while he was stuck under the Avenger Headquarters, he is saying "Eject, eject, eject". A pilot would say this to their backseater, or other pilots if it's clear that their vehicle is not operational.