BTW, I always hated the "inside the mothership" ending.
For one, it's just boring. Nothing happens so we just see Roy wander around what looks like some kinda alien shopping mall.
For another, it's wholly anticlimactic. The emotional drama climaxes with Roy's departure, so the interiors of the mothership just feel pointless and add nothing.
Do some people like those shots? I guess, but I loathe them.
I don't like any of the endings to this movie. The story climaxes when the ship lands and Roy sees the aliens descend the ramp, thus validating his obsession and everything he's done. Let the John Williams score swell up and cut to credits right there, and it'd be a nearly perfect film.
Whether you see the interior of the ship or not, having Roy abandon his family to take a joyride on the spaceship crosses the line from Roy being a complicated character to being a loathsome one. What an a'hole. Especially when we've already seen his new aliens buds ripping an innocent child away from its mother's arms for reasons we will never know.