Continuity: When Frasier and Martin are yelling at each other about the mess on the carpet, Marty is holding a red plastic oil container. In one shot there is a noticeable dribble of oil on it, but in the shots before and after, it is clean.
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Quotes
Frasier: Roger, at Cornell University they have an incredible piece of scientific equipment known as the Tunneling Electron Microscope. Now, this microscope is so powerful that by firing electrons you can actually see images of the atom, the infinitesimally minute building blocks of our universe. Roger, if I were using that microscope right now, I still wouldn't be able to locate my interest in your problem.
Trivia
At one stage, Niles refers to Frasier's 'Big red clown shoes'. Kelsey Grammer provided the voice for Sideshow Bob in The Simpsons, a clown character who wore such shoes. In fact, in the first episode Kelsey Grammer's voice was used, those shoes were key to the plot. See more...
Frasier (1993) - 3 mistakes in "Bla-Z-Boy"
starring David Hyde Pierce, Jane Leeves, John Mahoney, Kelsey Grammer, Peri Gilpin (add more)
Updates: 
Series 10
Bla-Z-Boy (season 9, episode 7)
Continuity: When we first see Marty on the floor oiling his chair, his cane is lying on the floor with the handle end pointing towards the kitchen. When he picks it up a few shots later, it has turned 180 degrees and the handle is pointing towards the door. At no time did he touch it.
Continuity: When Frasier comes home, just after Marty has sprayed oil on the carpet, the pattern of the spray changes considerably from one shot to the next.
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