Bush League is a matter of opinion when it comes to many things. Personally I think it pertains to how a player or team acts more than anything.
Some things would be considered "Bush" league in one instance and be considered intelligent baseball in a different situation.
Faking a catch or play is done all the time. It is done with a specific purpose, usually to fool the baserunner from doing the right thing.
A shortstop acting as a flyball is a groundball when a baserunner is stealing a base so the baserunner might not react and be doubled off is an example. Also acting like the ball is in the air when it's on the ground to keep a player from advancing properly. This stuff is done all the time. If baserunners can "fake" steal why can't fielders "fake" making a play?
If anyone except ARod would have done what he did (call for a play) no one would think twice about it. Same goes for trying to slap the ball out of someone's glove. Yet, no one considers it "bush" league when a runner blindsides a catcher at full speed and plants him in the first row.
IMO - The true "Bush" League stuff would include things like fake tags when there is no advantage by doing so.
The hidden ball trick has been done in the Major Leagues. It also helped win the College World Series. Not sure I would call it bush league. Here is an interesting video... Ozzie Guillen Hidden Ball Trick