Slight bump is fine.
I do not know what temp range alligator lizard eggs can withstand and be normal.

I do know that with snakes, heat spikes can cause increased occurrence of kinked spines. What constitutes a heat spike too hot depends upon species though.

On the hot days - I've been cooling my eggs - if the ambient temp of the room they are in hits 85 - I put them in a closet in a room on north side of house, where it is cooler.

I don't remember the paper, but there was a study done on tropical snakes - snake eggs that had a constant temperature hatched out long and skinny while snake eggs that a range hatched out short and fat.
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6.8 L. getula californiae - 11 eggs (Cal. King)
1.2 L. getula nigrita (MBK)
1.0 L. getula floridana (Brooksi)
1.0 Pantherophis guttatus guttatus (Corn)
0.1 Pituophis catenifer catenifer (Pacific gopher)
3.3 Elgaria multicarinata multicarinata - 14 eggs (Cal. Alligator Lizard)