Corrected entry: Sonic uses the word "southpaw" during the baseball scene. The word "southpaw" means that you're left-handed. However, in the bar scene, he is shown writing his bucket list with his right hand.
Corrected entry: During the bar fight notice two women, a blonde and a brunette, they're ready to use beer bottles with the blonde's back to the audience. Then, once Sonic has tied everyone's legs together, they've suddenly switched places.
Correction: Background is different in these two shots, so they didn't switch places but merely were shot from the opposite angles.
Corrected entry: Maybe it's the lighting on the Mushroom World but Dr Robotnik's mustache looks red when prior to that it was brown.
Correction: This may have been intentional. In the final scene on the Mushroom Planet, Robotnik looks closer to his video game counterpart; he shaves his head and his mustache is much longer.
This is probably done to make way for Eggman in the second movie (which is in talks).
Correction: Sonic was pretending to be different players, some were right handed and some left handed. He's batting right handed, but on the mound he is in fact pitching left handed. When he's being the "space case" in left, he's also shown to be left handed (glove on the right hand). When he throws the ball home, he throws right handed.
Bishop73