A girl kisses Knuckles.

A robot is called a pervert after looking up a girl's skirt.

An old man wants to marry a young girl. He, at one point, fantasizes having children with her, and her breastfeeding.

Tails falls on a girl and his hands land on her breasts, though by accident. Knuckles then says, "I never thought you'd stoop that low", a very crude sexual comment.

At one point, Sonic falls on the tip of Robotnik's rocket and it is implied that he landed directly on his groin.

This is mostly your typical run-of-the-mill Sonic violence (smashing robots). However, there are some violent moments, such as Metal Sonic strangling Sonic with only one hand, and an aircraft exploding with no casualties.

In one scene, Sonic flips the middle finger at Metal Robotnik, while Tails makes childish faces at him as well.

There is a scene where Knuckles is stuck to the ground and says "Now, I'm stuck". However, in the orginal Japanese dialogue, he says, "Shit" or possibly "Oh, Shit"

None.

There is one moment in the film where Metal Sonic approaches the Old Man Owl looking after Sonic's house in a very memecing and thretening manner, we briefly see the Old Man Owl scream through Metal's Terminator-esque POV.