Other mistake: Harriet phones a plasterer to repair a wall in the boys' bedroom. He says he will be there the next day. Ozzie phones Mr. Baxter and asks him to replace a broken rain gutter. Baxter comes to the house and tells Ozzie he has two big jobs to finish and "it will be about a week" - but he shows up the next day, same as the plasterer.
Other mistake: The clock shows the time as 2:20. Ozzie goes outside and spends five minutes talking with Mr. Thornberry. When Ozzie comes back inside, the time on the clock is still 2:20.
Rover Boys - S1-E18
Other mistake: David's teacher is called Mrs. Fraser in some scenes and Miss Fraser in other scenes.
Other mistake: Ozzie has just brought the mail in. He says, "Here's a bill. Here's another bill." Instead of looking at the rest of the mail, he hands it to Harriet, telling her, "I've had enough bills for one morning." The time on the clock is 4:15.
Other mistake: Cathy Calhoun is knitting a pair of socks for her brother, and offers to make a pair for Ozzie. She tells him, "If you really like them, I could get some more of the material." Knitting is done with yarn, not material. (00:06:50)