To help kickstart this discussion, I thought I'd add a couple of further points to the following:

If you were lucky enough to be...

S1 T6 on Level 2

S2 T2 on Level 1

S2 T5 on Level 1

S2 T10 (winners) on Level 1 and Level 3

S3 T11 on Level 1

S6 T1 on Level 1

S6 T5 (winners) on Level 1 and Level 3

S8 T4 on Level 1

...then you only needed one of your two clue objects and were therefore spared this risk.

S2 T10 - can also be argued that they could have got through Level 2 with no genuine clue items. The bottle prior to the Clue Room of course turned out to be a hindrance and the Sorcerer's Stone trick was a decoy action to fool Olaf so that they could access the wellway.

S8 T4 - interesting to note that the scroll in the Level 1 Clue Room stated "Keep Your Eye On The Clock", which was a reference to the hourglass that wasn't actually needed to progress to the next level. Bit of a random theory here, but perhaps the fireball chamber could have had the fireballs speeded up and the hourglass would have to be tipped over here in order to slow them down?

S4 T6 (winners) - perhaps also worthy of an honourable mention as they could only carry one other clue item due to transporting the bottle from Hordriss in Level 1 over to Brother Mace in Level 2.