Originally posted by John Lambert:
For what it is worth, Lex being more aware of what happened then he seemed to be would not lead to a conclusion of "Lex was not there". It might lead to a thought of "Lex had this taped". Actually, most likely it leads Lois to think "Lex has the DP bugged", but doesn't she already know that?
I agree, but it's just one more instance of Lex acting inconsistently to signal that something's off.