It depends what you call BIG Dave? Loads of differences.
You see Nemesis is correct...The boats being unable to dock is a big BIG deal, but also on the 1960's picture there are no kiosks, businesses, storerooms, slides, and rides on the right hand side as you go through those gates.
I reckon that Mick Edwards, The Music Man.....''As heard on the radio, appearing here regular!'' (always tickles me that) Might consider it a big difference that his kiosk isn't there? L0L L0L L0L