Lew tells Mannix he will give evidence of libel for his accusations against Mr. Houston. Libel is for written statements; Mannix's oral statements would be slander.
Mr. Houston fires 4 rounds from a revolver after a security guard had already fired 3 rounds. As is well known, most revolvers have but 6 rounds in them before requiring a reload.
During the fight scene in Mannix' bedroom, the cameraman is briefly seen in the dresser mirror.
As hard as it is to believe that Betsy all by herself could somehow make her way through Los Angeles to find Intertect, it appears she has no adult taking care of her. When he first meets her it never occurs to Mannix to ask who is taking care of her or if anyone would be worried about her being all alone. Her father is awaiting execution, her mother is dead, and the only people who are ever seen taking care of her are Mannix and Wickersham.