In Frozen, the ice in Olaf’s drink is shaped the same as his body (head, torso, butt, feet).
32Men in Black
In Men in Black (1997), when Will Smith is looking at the two space ships at the MIB headquarters, if you look in the background Zed and K are there typing on the computer. But if you look closer you can tell that they're not even touching the keyboard.
In Harry Potter and the Sorcerer’s Stone (2001), Harry’s scar hurt not because of Snape, but because he was facing the back of Quirrell’s head aka Voldemort.
34The Hunger Games
In The Hunger Games (2012) when Katniss is hallucinating/remembering we see all the coal miners have her father's face.
In Thor Ragnarok, when Dr. Strange uses Thor's hair strand to find Odin he casts a spell with his hands forming this familiar symbol called Triquetra that was also engraved on Mjolnir and has been a thing of the Asgardian culture.
In Spider-Man 3, a scene when Peter Parker sits in Jameson's chair and Betty is in the background just so clearly into it.
American singer Jimmy Buffett heroically rescues a couple Margaritas in Jurassic World.
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.