Certification
- Australia:PG (Seasons 2, 5, 6, 7, and 8)
- Australia:M (season 11, 12, 13, 14, and 15)
- Australia:MA15+ (season 9 & 10)
- Germany:12 (DVD rating)
- New Zealand:PG (season 1)
- Norway:A (TV rating)
- Poland:12 (self-applied)
- United Kingdom:PG (self-applied)
- United States:TV-PG
- United States:PG (DVD rating)