Heat sink on the thrower is rounded off at the top and bottom in Ghostbusters II.
Ghostbusters
Ghostbusters II
Padding on the top of the ALICE frame is attached via electrical tape wrapped around the foam and frame in Ghostbusters. In Ghostbusters 2 the foam is much thicker and attached via cable ties.
GB1 style, the foam is wrapped around the frame, then black electrical tape wrapped around to keep in place.
GB2 style, using cable ties
An Additional layer of padding was also added to the GB2 pack for comfort.
GB2 shoulder straps in certain scenes were custom made padded straps for additional comfort
Ghostbusters
Ghostbusters 2