Well Ra being abducted would be restoring original missing effects.
The staff weapons is just putting the beams and putting a yellow glow on the air canons under the sand from special edition.
The space shots at the end will be updated the planet and ship explosion will be updated but will be exactly the same sort of…
That is kind of it more or less visually the rest requires more audio editing to make scenes or extensions / deleted footage work. I am not a visual effects artist but I will try to do simple stuff. The hard part is getting a load of deleted footage working and getting the continuity correct.