This is nothing terrible, but still worth mentioning.
When the game tells you to use your coins to buy Jelly Shield, it tells you that it allows you to perform seven uninterrupted jumps. This is not accurate, as this depends on how many dangers are in your way and how deftly you know how to avoid dangers.
As soon as the Jelly Shield prevents one disaster, it is up to you to avoid others. This may happen within one jump, or not at all in the entire sequence of jumps.