Certification
- Argentina:13
- Australia:M (DVD rating)
- Brazil:18
- Canada:G (Quebec)
- Finland:K-18 (2007, DVD, self applied)
- Finland:K-15 (2005, DVD, season 1)
- France:Tous publics
- Germany:12 (internet)
- Iceland:12 (some episodes)
- Iceland:16 (some episodes)
- Ireland:15
- Italy:T (DVD rating)
- Japan:A
- Mexico:18+
- Netherlands:12
- New Zealand:M
- Norway:11 (DVD rating)
- Poland:18 (DVD rating)
- Singapore:PG
- Spain:13
- Sweden:15 (self-applied)
- United Kingdom:18 (one episode)
- United Kingdom:15 (some episodes)
- United Kingdom:12 (some episodes)
- United States:TV-14
- United States:TV-PG (some episodes)