If you hit Bombino with a normal bomb which cause it to explode, you CAN interrupt bombino´s explosion by hitting it with a blue bomb. I dont know if you can interrupt explosion by any other items that stun fruts, like

.try to discover that!
when you beat Tuber in multi mode, so if Sandy go to the lift first, Igor will teleport to the lift, but we can see only Igor in the lift and we cant see Sandy. i dont know how it works if Igor goes to the lift first, but i think it looks like Sandy will disappear.try to discover that!

If you see a banana when its looking for jump, it will always jump to your initial location (if you are above it and then you move down, it will jump up, not down). But when you see a lemon is firing, he will always fire to your present location. with that jumping I think its same at all the fruits.
if you are able to go to the lift at the end of the game, wait until a fireball appear and go to the lift so it can kill you when you are standing in the lift and lemon is going to the lift - you will lose a life but igor is still standing here - then you can see a bubble falling down (i think igor´s skin will disappear hwn he reaches the lift)