The two guys who beat up Charlie for fighting the mascot are the same two guys who threatened Mac for punching Carmen in Charlie Has Cancer (2005).
All of the baseball merchandise spelled out Phillies with a Y (ie Phillys). This was done to avoid copyright/trademark infringement
'Ollidy Inn' (Holiday Inn) is one of the many changes made to avoid copyright infringement.
The "Phillie Phanitic" is referred to as the "Phrenetic" and all baseball merchandise is spelled "Philly" to avoid copyright laws because the MLB declined to allow them to be used in the show. You can hear Charlie argue this as he leaves the court room at the end.