We’re not sure what this means, but we’re making a guess that it may be a reference to the episode “Night of the Shriekers.”  There are several times in that episode where shriekers and other things are affecting the power in Burt’s bunker, so lights are flashing.  Also, for dramatic effect, the editor put in a negative close-up shot of the scientist Megan (Melinda Clarke), right before the shriekers get her.  It’s sort of an odd shot, but presumably the director okayed it.

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