Case 1: The extra roll tunnel

In the Beta, there is an extra roll tunnel (the one just in front of Sonic) at the start of act 2.

Case 2: Roll trunnel beta properties

In the Beta, Sonic does not curl up in to a ball when you enter a roll tunnel. You can run through them like in Sonic 2 beta.

Case 3: Extra Flowers

In Sonic CD beta there are unique flowers for each level. These are the ones found in Collision Chaos.

Case 4: Electrocution

In the beta Sonic can be electrocuted by Metal Sonic. Also, before Metal Sonic breaks thought the spikes they are normal upwards ones. In the final the spikes are sideways.