I noticed that on SA2, on the Hero Side, The scene where Sonic first sees Shadow is before the scence where Rouge is trying to get Knuckles to give her the ME. But the the Dark Side, it's vise versa. Please tell me why. Thanx SHQ!
The Dark Side's story starts before the events of the Hero Side's, so the events don't match up per level. Chronologically, Sonic's first encounter with Shadow happens after Rouge and Knuckles's meeting in the desert.

~ Crazy C Lea