Some things I've noticed:
Howard's really quiet for 89 minutes and 50 seconds of a game but has a random 10 second spurt where he goes absolutely mental at his defence.
Coleman does a lot of gesturing with his thumb.
Jagielka tilts his head to the side when talking to refs, much like a dog.
Distin is always telling people to calm down by doing that thing like Ross on Friends.
McCarthy has murder with opposition players every game.
Pienaar makes this face when someone misplaces a pass to him that looks like he's about to cry/has tasted something horrible.
Lukaku tells teammates he wants a pass to feet by bending over and placing both palms out with his hands towards the floor.
Eto'o tries to get people booked by card waving/getting in the ref's face for 3 seconds then smiling and laughing when an opposition player clocks on.
Martinez does a lot of talking with Barkley. Seriously, watch it. Whenever there's an injury Barkley's over there having a drink and getting advice.