Corrected entry: In the scenes at the symphony concert, the orchestra is supposed to be playing Beethoven's Ninth Symphony. But in the first concert scene - a very quick snippet - they are playing Mozart's 40th symphony instead. Also, in the movie, both the Mozart 40th and the Beethoven 9th are seen employing a piano (although only the Mozart has the piano audible). In fact, neither of these symphonies requires a piano - there's no piano at all in the score of either one.
Corrected entry: In the highway chase scene, the banner reads "Suicide Hotline, 1-800-O-DON'T-DO-IT!" In reality this number would have been invalid because it contains 12 digits rather than the 10 digits permitted by the FCC (not including the 1 or 0 in most long distance and 1-800 numbers).
Corrected entry: Early on in the movie, KAOS leader, Siegfried, announces to the United States government that he has distributed 20 nuclear weapons to unstable dictators and will supply them with the activation codes unless the American government pays him $200 billion. However, after Max and Agent 99 secure the bomb at the Walt Disney Concert Hall, everyone seems to completely forget that there are a bunch of atomic bombs still in the hands of dangerous terrorist organisations just waiting to blow them up.
Corrected entry: When Max is 'captured' by Sigfreid and they are watching Agent 99 on the video feed, Max says something like, "Mrs. Spalkis must be lost," as well as making several other obvious references to the fact that he has been caught. Agent 99 can hear every word he says, and yet she doesn't even react to Max's suspicious quotes until he says, "99, we've been compromised."
Corrected entry: When Smart is bashing Shtarker's head against the optical scanner to break out of the bakery, watch the scanner carefully. Although it's supposed to be made of hard plastic or metal, whenever Shtarker's head hits it, the scanner flexes inward then pops right back out with each successive blow. Obviously a movie prop; thin film covering foam rubber to keep the actor's face from getting injured.