Flags that are allowed in to many many places
300 because they are racist
4 corner flags. 2 linesmen offside flags.
11 for each team.
3 per half
a maximum of three substitutions are allowed per game
Canadian football is played with 12 players per team.
4. 1 In Each Corner
The coach is allowed 1 challenge per half, but unlike the NFL every play in college can be reviewed by the refs challenge or no.
22 players are allowed on the field for a play, 11 on offense, 11 on defense.