I was watching '21' a few days ago and noticed that 'Everybody Get Dangerous' was playing in the background during a bar scene.
Jackass 3, "Memories" and there was a short clip of them recording "Memories" in the credits.
Meet The Deedles, "American Girls" even though technically that was Homie which only featured a few of the members.
They have also had load's of songs that have appeared in many show's (The Simpsons, Raising Hope etc).
I'm sure there are plenty more films that they have been in and i think a few of their Christmas songs were in a few i know that a Christmas song was in Going The Distance.
Angus- "You Gave Your Love to Me Softly"
Jackass 3D- "Memories"
Shrek Forever After- "I'm a Believer" [The Monkees Cover]
Cars 2- "You Might Think" [The Cars Cover]
Psych- "Dope Nose", "Troublemaker"
Malcom in the Middle- "Beverly Hills"
The Simpsons- "Island in the Sun"
The Sopranos- "Island in the Sun"
That's what I've seen. I love both Psych and Cars, so I was excited when I heard them on those.
IYWIIWYTIWYT was recently played in Love Bites (ep3), Teen Wolf (ep1)
Then there's Weezer playing live in RJ Berger
In Love Bites (ep4) they played 'Blowin' My Stack' for a good minute.
And these are just from episodes I watched in the last month.
Movie is coming out Nov. 23 and album will be released Aug. 23