Question: Why would Catherine take the blame for the lab explosion? If anyone was to blame it was Hodges. Since he accidentally turned on the hot plate and even admits that sometimes it gets switched on by others accidentally, if he had bothered to make sure he didn't switch it on before leaving the room, the explosion never would have happened.
Question: Sarah asks Grissom to have dinner with her. Moments before, Grissom removes a card from his filofax thing for a 'Dr. Karen Roth'. I'm uncertain, but is this the blonde entomologist he had chemistry with in an earlier episode (they were discussing their mutual love of tarantulas, I think)? If not, who is it?