Depends on the version, but I also think I´ve encountered versions of the game that have a bug where the plant burps but the character still says “it bit me” when trying to climb up.
I also discovered that sometimes the telescope doesn´t register all of the coins. it disappears from the inventory, but it doesn´t make a sound and you can´t push the button. That means you don´t have the freedom to waste a single coin. Move it once in the false direction and you can forget about it.