On The Russian Connection, in one of the houses that has some stairs, there is a door when you turn to your right. DONT go in, instead, stop and listen. They will say funny thing, and once they are quiet, rush in. As you go in, one of the henchmen will be sitting down while the other has his head in between his legs!!!Also when you get the disguises, you can find to henchwomen in the railway talking about their love life!!!! LOL!!!
On the mansion madness level, and when you have to fight the deer hanter go into the little hole in which he made when he escaped. Stand in the corner of it and wait for him to come over to you. He can't hurt you but you can defeat him easily. Make sure you have a shotgun with at least 30 rounds in it, and also take a revolver with you.