There are so many differences on the NES version: game sounds, hammer placement, location of the rescue platform and prizes, two umbrellas on the rivet stage, etc. But what really caused me to perform a double take was seeing someone take the circuitous, "down low" path on the elevator stage. Aside from being employed as a defensive maneuver, when a fireball quickly descends the ladder just before the bottom prize is collected, I can't remember the last time I've seen a player intentionally take that route.
Wait a minute, am I actually critiquing the gameplay of a 3-year-old? Has it really come to this?!