YESSSS. So good to see this again, thank you!
... Did the player just land the pterodactyl in a random place in the clip at 2:36? And there's no landing pad near the gas station like there is in the final game, either... Were you originally able to land flying vehicles/creatures anywhere...? I can see how that'd lead to plenty of bugs with landing in awkward places, but dang, the landing pads were one of my main gripes when playing the game as a kid, haha.
Edit: The helipad at the jail is also not there in this footage, here's a comparison with the model from the final game:
And a comparison with the clip featuring the pterodactyl:
So yeah, I'm pretty sure landing pads were a fairly late addition to the game... Heh, it's the opposite of the first game, where the helipad texture was removed and we've only seen it in beta screenshots (and the game intro):
http://www.lugnet.com/pause/techzone/games/legoisland/
Oh! Also interesting to see how the sky in Castle Island changed from this beta video to the final game, getting less dark - the same change happened on PS1, see the end of this post: