When David confronts Emma, exclaiming that he deserves to be the father of Emma's baby, David bikes away after his little speech. While biking away one of his spokes blow out causing him to nearly hit an officer on the sidewalk, a very tame event. With the unhinged bicycle spokes David then decides to walk the bike. While he is walking the bike we hear the clicking as though the spokes we not unhinged, which visually isn't the case.
Emma is seen with a large pregnant belly while painting her house, but later when she is about to meet with David's family while walking on the sidewalk with David, she has a flat belly. She is supposed to be pregnant the whole time until she delivers the baby near the end of the movie.