Trivia: In the beginning of the film, young Sonic gives Longclaw a flower with spiky petals. This flower is actually based on a flower sprite from the original "Sonic the Hedgehog" video-game for the Sega Genesis. (00:02:16)
Continuity mistake: After Sonic runs by the radar gun the first time, triggering it to show a 296, Tom picks the radar gun up and looks at it. In the view of the radar gun, he lifts it and has it tilted to the left of himself, left of screen in this shot. When it cuts to a front angle showing his face, the radar gun is now tilted to point to his right, which is now still left of screen. (00:04:49)
Deliberate mistake: At the speed trap, Tom points his radar gun at a turtle. From his perspective, he seems to be looking through some sort of scope with cross hairs and numbers on it at the turtle to line up the beam. However, when he then looks at the radar gun at the speed indicated as 1 MP/H, there is nothing on the gun where he could have been looking through such a scope. At best, the top of the run appears to have plastic iron sites. The scoped view would not have been from the device itself perspective since it would not need cross hairs or numbers on said cross hairs as that would be for a person looking through it to have reference points. This scope view of the turtle was most likely just added by the film makers to have a better visual representation of Tom aiming the radar gun at the turtle. (00:04:29)
Continuity mistake: As the Echidnas first start attacking Sonic and Longclaw, she slams the door shut quickly to catch the arrows shot at them. The In the close up of the door from the outside, the arrows are in a different pattern and are closer together than the holes when seen from inside that are a bit more spread out. (00:02:23)
Continuity mistake: At the start of the film, Eggman is chasing Sonic through the streets and there is a shot of the city skyline down a street behind Sonic as he makes a turn. The camera then cuts to inside Eggman's ship to a close up him with the city skyline still behind him, only now it's different buildings behind Eggman. (00:01:00)
Answer: First, it seems Sonic doesn't shed his quills that easily. Tom found one just by sheer luck. Second, yes that ring is likely going to play a part in the sequel.