Continuity mistake: When Lynette sits with Gabrielle in the kitchen discussing the kiss, they're drinking shakes. Gabrielle is either holding her shake or it sits on the counter in front of her, repeatedly, depending on camera angle.

Desperate Housewives (2004)
1 mistake in One More Kiss
Carlos: You know who you are, Gaby? You're the kind of person who would have turned away Mary and Joseph from the inn.
Gabrielle: Well, they should have called ahead.
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.