Especially if you bought the '90s CD expansion - no songs and the complete "Into The Starscape" (for the final scene of the film and continuing over the end credits), criminally missing from the LP that came out in 1984 (the LP version cuts out after the point in the film where Louis whoops). Taken Up to Eleven with the 2015 further expansion, which has the entire score!
Cult Classic: Despite the build up to a sequel, it didn't get one. However, it still has a following.
Gut Punch: Centauri's death. Up to that point, the film had been a lighthearted space flick.
Hilarious in Hindsight: Grig says he prefers to think of death as going to another dimension. One wonders if the team behind the infamously Bowdlerized first English dub of Dragon Ball Z took inspiration from this.
I Am Not Shazam: The spacecraft are called Gunstars. The Starfighters are the elite recruits manning their gunnery chairs.
Similarly, the game featured in the film is simply called "Starfighter".
Narm: The trailer park inhabitants reacting with much excitement to Alex managing to beat the game.
Also when the drifter is (replaced? transformed? awakened?) as a Xandoxan. The almost seizure-inducing malfunction of the video game screen didn't help.
Fridge Brilliance: He was a Xandoxan all along (remember, he had a pistol that clearly didn't come from Earth). The "drifter" was merely his disguise, which the "malfunctioning" video game stripped away (probably something Centauri secretly added to the machine for that purpose).
When Xur broadcasts the execution of the spy he's captured to the Star League.
Paranoia Fuel: Of a sort, though probably of a more hope-inducing than fear-inducing sort. Admit it, if you saw this movie when you were a kid, every time you start doing particularly well at a video game, part of you wonders if someone's about to show up and recruit you to save the world.
Visual Effects of Awesome: While the effects were Obvious CGI even at the time (the CGI effects were done with the equivalent of a smartphone's processor), the Death Blossom and Star Car sequences still hold up.
There's some good make-up work as well. There are over half a dozen distinct alien species, and only the Rylans are simple Rubber-Forehead Aliens.