I got the coin in the drawer, and the one behind the picture, but I can't find another. According to a walkthrough, there should be one in a nest in the room with the tightrope, but even though the creature stands up from the nest- no coin. Also can't find a coin in the room with the coin machine. Help!?!

There's only three. Drawer, behind the picture, and the one in the actual room with the coin machine. The one in the room is on the "floor" just to the left of the door you enter in (attached pic). If it's not there, then...dunno.

No coin for me either in coin machine room.
Did anyone have and solve this problem?

This is going to sound odd, but did you actually put the two coins you have into the coin machine yet?

Now that I think about it, the 1st time I played that room, I hadn't found the coin in the drawer....Yet when I put the 2 coins I had in the player, it still rained enough to get the chicken. Acted a little bit weird (the clouds got stormier and stormier on their own for long period).

Next time I did the room, the 2 coins didn't do it and I grew confused by that, til I found the other coin. So sounds a bit glitchy.