Comedy movies are hilarious because they often feature a main character making a completely boneheaded mistake. But you know what isn't funny? Mistakes that the filmmakers commit while shooting the film! We are talking about cameramen sneaking into a shot (gasp!), visible wires during stunts (gasp!!) and even ... continuity errors (GASP!!!).

Yes, mistakes happen in every film. Luckily, most of the time they don't have any negative effect on the final product. So, in honor of comedy films old and new, lets take a look back at the biggest mistakes in comedy flicks. (As always, a big thank you goes out to MovieMistakes.com for helping us create the post. Head over to their site for a full database of movie mistakes.)

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  • 'Groundhog Day'

    When the same things happen over and over again in a film, you're bound to get <em>something</em> wrong. In this scene, when Bill Murray's character Phil comes around the corner, you can see a woman carrying a yellow shopping bag and walking with a friend -- something that goes on for the first few days. However, on the last day, the woman is walking by herself.

  • 'Scary Movie 2'

    When Father McFeely arrives at the Hell House, the cab he's in parks right next to a light pole. Between shots, the position of the lamppost and the car noticeably move.

  • 'Animal House'

    While his ridiculously high BAC level may have been enough to help him sustain a two-story fall, Bluto (or the future Senator John Blutarsky) luckily had a little help with this stunt. After climbing up a ladder to peep into a sorority house, he ended up falling backward -- right onto a carefully place grass-covered mat. Look closely in the picture; you see where the grass is clearly raised?

  • 'Beverly Hills Cop'

    Eddie Murphy was hilarious in this movie -- and so were the cars his fellow officers were driving. Last time we checked, police departments didn't paste numbers on top of their vehicles, they painted them on. As you can see in the photo, the filmmakers opted for the former method

  • 'Anchorman: The Legend of Ron Burgundy'

    Ben Stiller and his Spanish news team ultimately lost the street fight between rival anchors during this scene in "Anchorman." However, if they had had the seven people they started out with (see top photo), a number that quickly dwindled to six a second later (see bottom photo), perhaps they would've been the one chucking tridents.

  • 'National Lampoon's Christmas Vacation'

    Clark Griswold always seems to find new ways to humiliate himself, like when his ladder collapses while trying to set up his Christmas lights. However, things could have been a tad worse for old Clark if he didn't have a wire holding him up (see photo).

  • 'Airplane!'

    In most movies, seeing a crew member accidentally show up on camera could take away from the overall feel of the film. But in a comedy like "Airplane!" it's actually pretty funny.

  • 'Ghostbusters'

    To save money, sometimes filmmakers will use the same shot twice. Take, for instance, "Ghostbusters." After the guys rent the building which will serve as Ghostbusters headquarters, we see a shot of New York City from Central Park. Then at the end of the film, before the battle with Gozer, audiences see that very same shot from before, albeit with a different color sky.

  • 'Happy Gilmore'

    If Happy Gilmore is throwing you down some stairs, you better believe you're going to end up with some bruises. Perhaps that's why the actor from this moment in the film can be seen wearing what appears to be a kneepad underneath his pants.

  • 'Austin Powers: International Man of Mystery'

    When Austin and Vanessa are trapped in Dr. Evil's lair, they use dental floss to escape. Apparently, that dental floss was connected to an industrial cable screwed into the ceiling.

  • 'The Blues Brothers'

    We'll let you be the judge of this mistake. During the classic 1980 comedy "The Blues Brothers," there's a chase scene where a cop car flips over and starts spinning on its roof. From the looks of this screengrab, there's a circular rotating plate directly underneath the roof.

  • 'American Pie'

    "American Pie" took place in Michigan. The problem with this scene? Those palm trees in the background, which most definitely do not grow in Michigan.

  • 'Shaun of the Dead'

    This zombie comedy was filled with zombies! And in this particular scene, a black mat with tape stuck to it -- something that definitely wasn't supposed to be there (at least the filmmakers got it out in the next shot).

  • 'The Naked Gun'

    Closing your hand in a window hurts, unless of course you have a safety block there to hold it up, as you can plainly see in the photo.

  • 'Mean Girls'

    Tina Fey is a comedic genius -- and according to this scene in "Mean Girls," she's a terrific magician too, as her pants miraculously change from brown to black in the same scene.

  • 'Trading Places'

    The greatest trick Dan Aykroyd ever pulled (well, besides convincing people that a "Ghostbusters 3" is still a possibility)? Having his hair change from one style to the next in this post-jail scene in "Trading Places."

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