Related Clues:

• Waste time (with "off")
• Big goof
• Lulu of a slip-up
• Minor mistake
• Mike's unfortunately-nicknamed friend on "Growing Pains"
• Err
• Minor error
• Huge mistake
• Dumb mistake
• Anachronism, e.g.
• Huge goof
• Embarrassing mistake
• Screwup
• Mess (up)
• Careless mistake