These are what we call the 'YMMV items.' Things that some people find in this work. We call them 'your mileage might vary' because not everyone sees these things in the same way. This starts discussions in the trope lists, a thing we don't want. Please use the discussion page if you'd like to discuss any of these items.
Critical Research Failure: It takes about six-and-half-years to get from Earth to Saturn. How did Melty get back to Earth so fast?
Designated Hero: Ted Nelson doesn't do a single heroic thing at all. Hell, the woman who cut off one of Melting Man's arms when he tries to kill her comes off as more heroic.
Narm: Plenty, the nurse's slowed-down running scene near the beginning, or the fisherman's line, 'Don't scare away the fishes.'
The elderly citrus thieves are completely bonkers.
"DON'T SHOOT! I'M TED NELSON!" (blam!)
All of these are almost certainly artifacts from the original plan to make the film a spoof. There are tons of things left in the flick that could have very easily been played for laughs, only they weren't.
Narm Charm: Helen and Harold, the elderly couple, are funny and adorable.
Nausea Fuel: Pretty much the entire movie. The astronaut even leaves puddles of himself behind with every step!
The Melting Man's death scene is particularly gruesome, though.
Padding: Dear God, yes. The same "You've never seen anything til you've seen the Sun through the rings of Saturn!" transmission, and so on.