A friend of mine was in a 50nl game and I want to know the correct play for him. sb/bb and 2 others mid posistion called down the blinds to him and he raised 4 pre flop. 4 others called and he floped Ah Ks 4c.....
Checked down to him and he bet $3 on the flop...pos 4 and 5 call.

Turn is 7d ////he bets $3/////pos 5 calls

River is a 2c he goes all in($30)////pos 5 calls

Please help my friend out ...I think there are a few huge mistakes....

Trips could of easily slow played...
Im lost for words....
How bad can you bash on this play....????