Family-Unfriendly Aesop: The Doctor manipulates Sarah Jane out of a situation in which she's panicking and screaming by giving her a very hurtful and rather sexist "The Reason You Suck" Speech until she pulls herself together out of pure rage. It's an awesome moment and one of both Sarah Jane's and the Doctor's best, but does give the impression that bullying your best friend and crushing her self-esteem is a good idea to do to someone in a panic.
Narm: The scare factor is somewhat muted by the bubble wrap.
Special Effects Failure: Everything, but especially the green bubble wrap. At the time bubble wrap was too new an invention to be instantly recognizable, so they didn't really make an effort to disguise it.
Took the Bad Film Seriously: Faced with glaringly bright sets, a new Doctor who, while good, hadn't quite found his feet in the role yet, a very plasticy alien and a Body HorrorVirus made out of packaging material, Kenton Moore as Noah plays his role so passionately and convincingly that he turns a cliffhanger of him taking his hand out of his pocket to reveal it's wrapped in green bubble wrap from Narm to the sofa-chewing Nightmare Fuel of a man enduring a slow and excruciating transformation into a creeping wasp monster. Tom Baker's performance of a Patrick Stewart Speech in the first episode is also very strong and does a lot to show what the then-new Doctor can do.
The scene where the Doctor bellows sexist insults at Sarah in order to snap her out of a panic is particularly difficult to watch - Tom Baker has often expressed discomfort and embarrassment about playing the scene, and even that was heavily toned down from the scripted version, which was longer and meaner.
There's a pretty uncomfortable part where the Doctor explains his plan to see the dead Wirrn's memories through connecting psychically to a part of its eye. He relates it to something that "Gypsies" used to believe. Compare and contrast to a scene referencing this in "The Crimson Horror", where the Eleventh Doctor points out that the belief is rubbish without linking it to a specific racial epithet.