In the early part of the show, when Matt asks Kitty for help with Cara, Kitty's mole on her upper right cheek is covered up, as to appear it's non-existent.
Later on, her mole reappears.
While Matt, Chester and Sheriff Benson are eating breakfast in the Marshall's office Sheriff Benson describes Matt's old flame, Cara, as the female member of a bank robbing gang. Realizing this Matt suddenly loses interest in the breakfast he was enthusiastically eating a few seconds before. When Matt stands up and walks away from the table his plate has magically disappeared.
Matt doesn't know that Cara is in town, but when Doc tells him that she wants to see him, Matt goes to the Dodge House and up to her room without asking anyone which room she's in.
Chester follows Cara and sees her buy a train ticket, but he is too far away to hear the destination. He runs and gets Matt, who rushes to the train station and says something to Cara about her going to St. Louis. How does he know where she is going? He didn't stop at the ticket window to ask the agent.