
Continuity mistake: When Juliet and Mark are at his flat there is a tall metal self-standing hanging rack and a tall black art canister directly in front of certain canvases and frames. As Juliet inserts the video in the wide shot, the rack and canister are gone. Yet, in the next shot they are back. (00:52:45)
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 ★