>>2826810That's a really weird scene admittedly.
In the series they repeatedly make reference to the Roswell UFO crash as being a case where truth did not matter, only the perception of the event did. Even if a ufo never crashed there the effect it had on culture and media meant it might as well of just because everyone treated it that way. This is a parallel to whenever Lain changes everyone's memories so that they never remember the rumors pertaining to Alice. Even if the rumors were true and she did have an affair with the teacher, in the minds of absolutely everyone involved it did not happen and in a way it really never happened nobody remembers it. The alien scene happens shortly before Lain wipes her existence from everyone's memory so I guess it's just really bizarre foreshadowing.