Yeah, I was NOT happy. I wasn't there, so I couldn't argue the case.
There were two issues. One was pretty objective and we had a plan for that. The other was a result of a completely subjective rule.
The objective issue was that I bent the DFW axle. The rule's state that the axles could be polished, but no other mods were allowed. However, their rules linked to a video that talked about bending axles and setting steer ... so I thought I'd bend them but have a straight axle to swap in if it was flagged during check in. As it turns out, they were not flagged during check in and the cars raced with the bent axles.
The other issues all related to this rule:
All cars must be built using the kit provided, this includes the Pinewood block, axles, and wheels. With the exception of decorative and construction items (weights, glue, lubricants, finishing materials, artistic additions), only materials from the official kit may be used!
This rule, though very subjective, was strictly enforced. So, for example, I cut out the pine body and filled in with balsa. The balsa was flagged (after the race), because it wasn't in the kit. I would've argued its a construction item, but again, I wasn't there to argue and point out how ridiculous subjective these terms are.