Continuity mistake: Juliet arrives at Mark's flat and brings banoffee pie with her, wanting to see the wedding video. She slips the video into the VCR and places the open pastry box on top of the TV stand. As she takes her jacket off the pastry box is gone, yet in the next shot of the TV the box is right next to the remote, which then changes position in the last shot when the remote disappears. The TV is in the center of the stand in some shots, but to the left of the stand in other shots. The video cassettes, etc., change/alter their position within these shots as well. (00:53:10)
Answer: No, Keira Knightley's character is not in love with the best friend; her kiss is one of compassion and affection, not love. Richard Curtis mentions this on the DVD commentary - he says something about Juliet being the sort of girl who would be used to men falling for her and treating them gently and kindly, which is what she does here.
STP ★