In the ballroom scene at the start of the film the shadow of the camera is clearly visible on the clothing of the dancers as it pans past them.
Major plot weakness: despite the fact that, throughout the film, Ted's girlfriend Joy keeps telling him to keep out of trouble by not involving himself further with the criminals nor to insinuate himself into the police investigation, nevertheless at every opportunity she thoughtlessly incites him to do exactly that, not to mention spying on the suspects herself and worse--at a critical moment--rather than phone the police herself she calls Ted instead who she must surely realize would be placing himself in serious danger. Some "girlfriend".