During the fight at Faith's apartment debris against the wall under the television appears and disappears several times.
As Anya tells the Scoobies of the ascension she witnessed, her hands jump from resting on the table to clasped under her chin.
(at around 39 mins) During the fight between Buffy and Faith, both stunt doubles are rather noticeable.
During the fight at Faith's apartment, when the stunt women for Buffy and Faith crash through the window out onto the roof, the pads they land on are clearly visible, and are seen several more times during the fight.
During the fight in Faith's apartment, you can see over the top of the set at 37:49 (very briefly), 38:15 and 38:43.
After the Mayor is informed of trouble at Faith's apartment, the scene cuts to a wide shot of the fight on the rooftop, and for just an instant a crew member is visible off-set at the right-hand edge of the picture, along with a glimpse of what likely is the lens hood of the "B" camera silhouetted against the white of the crew member's T-shirt.
During the fight at Faith's apartment, when Buffy and Faith crash through the window out onto the roof, there are two quick high-angle shots of the window where you can see the studio's roof structure in the upper left corner of the picture.
At about 17:08 when Joyce walks through a door saying "Buffy I'm home..." the boom mic sweeps across the top of the shot.
At 20:49, as Angel enters Prof. Worth's apartment, the tip of the boom microphone dips momentarily into frame.