Movie Plot Holes

The mechanic was killed in the first one.

He also tried to kill Loomis.

But you’ve seen the important ones.

Halloween II is borderline okay. And it squares up a few things. 3 is not relevant at all to the Michael Myers universe, and I believe was intended to take the franchise in a different direction . 4 was reasonably atmospheric but was in line with 1980 slasher fare. 5 and 6 were pointless. H20 was the best after 20 years of sequels, and Resurrection was again, pointless. 

That’s right. My understanding was that he was being moved for the trial at aged 21 (so I think that makes him 21) which was referenced in the deleted scene. Loomis wanted the nurse to administer a sedative.

Pretty much what happened, supposedly first day of filming they decided Mike Myers needed a mask to make him scarier off the intern went and back he came back with the shatner one they painted it white and enlarged the eye sockets and hey presto

The big twist in the film is that one of the crew is an android. He's there to ensure the Company get the alien for research purposes. And all his actions throughout the movie, from start to finish, reflect this.

However, if the Company already knows of the existence of the alien, then why don't they just send a proper scientific ship to the planet instead. Relying on a cargo vessel to bring back an alien is just careless.

Now if the Company didn't know about the alien, then what is the android doing on board the cargo vessel in the first place?

If the Company knows or not, the whole android part of the story makes little sense.

Just pay the crew to go to the planet and collect an egg. If it's all illegal then pay them bonus hush money to keep it all secret. That's the logical thing to do. In space no one can hear you breaking the law.

There's no need for the subterfuge or killing anybody or risking the loss of the alien. The plan you describe would have probably involved having to kill the crew to prevent them from telling anyone about the alien. On a scale of lawlessness, bribery would be a far easier thing to pull off than murder. 

The story makes more sense as one where a crew accidentally stumbles upon an alien and everything goes wrong for them. This is what the audience is lead to believe for most of the film anyway. 

The part of the plot involving the Company is an unnecessary contrivance. It seems to exist purely to allow for the android twist.

The Ash character needn't have been an android and could have acted without instructions from the Company. He could have acted as he did for other reasons, such as wanting to help John Hurt when he was attacked, scientific curiosity, or even the the oldest motivation in the book: personal financial gain.

Or even if he was an android, he could have acted to protect the alien under some kind of protocol where his programming wouldn't allow him to let the other crew members kill the alien. 

In a movie about a rape victim giving birth, the android could have represented the most hardline of the pro-life faction of our own times. You could still even keep the scene where they bash his head in. 

In my opinion, that would have been more interesting than the big, bad, nefarious Company pulling all the strings from afar, which ultimately left a hole in the overall plot.

To make matters worse, the all knowing Company then forgot about the alien until Sigourney Weaver tells them about it in the sequel!

Was that the Die Hard Director's Cut with extra plot holes?

It's a little known fact that the director John McTiernan is a stage name John Sullivan used when writing in the US.  There used to be a US tv star called Ed Sullivan and he wanted to give himself a different surname to stand out more.