A while back I told you where you could make appear a money bag appear in Castlevania so that you couldn't actually collect it. But there are several more that you can actually collect.

Take the very beginning of the game, for example.

Most people will collect the powerups, and walk into Dracula's castle. But, if you hop over the entrance to the castle instead...

Free money!

You just have to remember to jump back over the entrance when you go to collect it, or you'll go in the door instead.