Other mistake: In the scene where Lynette and Tom are fighting about Lynette having taken Kayla to see a therapist, and Kayla walks away, you can hear Tom yelling about Lynette having a distorted reality and that she can't pull crap like that. In the scene where Kayla comes back into the house after conning the twins into jumping off the roof, Tom and Lynette repeat the same dialogue again.

Desperate Housewives (2004)
1 mistake in Opening Doors
Gabrielle: I feel a wave of morning sickness coming on, and I want to be standing on your mother's grave when it hits.
Trivia: Teri Hatcher (Susan), Felicity Huffman (Lynette) and Eva Longoria (Gabrielle) are the only cast members to appear in every single episode of the series.
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Answer: He was investigating the lead not the case.