"Fraidy Cat" marks the first and only appearance of Tim, who's presumably the twin brother of Tom. His personality is modeled after the series' character's one-time cousin George from "Timid Tabby", hence that Tim's name is the root word for "timid" based on his personality.
Sergeant Boffo mentions that he was previously a plumber.
Sergeant Boffo is the only cat character in this TV series who lacks a tail. It is unconfirmed for the reason behind being tailless.
Even though this show's episode "Friday Cat" shares the same name as the 1942 short from the originals, the plot of this episode is a modernized take on the 1957 short "Timid Tabby" and the guest character is the titular cat's presumed twin brother instead of being his cousin.