Continuity mistake: Lamar's javelin that he's seen running with is flexible in the middle and not very rigid, however when the shot after he throws it, we see a solid normal javelin going through the air and visibly a different one altogether. (01:06:30)
lionhead
9th May 2011
Revenge of the Nerds (1984)
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Suggested correction: It is a specially designed javelin by aerodynamics master Wormser.
It's clear that it's two totally different props being used for the scene: one that Wormser desired and the other is a regular javelin that would actually work when thrown.
I don't see why it couldn't be the same javelin in the air; you still see it wobbling, but there is less curve because it's not bouncing around anymore in Lamar's arm. The javelin that touches down is the same too. It's completely the same design too.
Just rewatched the scene. The flexible section that Lamar is holding is close to a foot long where it's flexible in the middle. The airborne javelin has a grip section that's at best half the size of the one seen on the one Lamar is holding. It's two different props by that design alone.