At the beginning of the episode Miracles, S3 Ep20, Ted is talking about which cab he could have gotten into. A battered car with taxi painted on the side is seen driving past and Ted wonders what would have happened if he had got in. Later, when Ted walks into the apartment the headline on the paper that Marshall is reading states "Nude Cabbie Vows To Kill Again" with an E-fit picture of the same driver of the battered car.
When Barney is leaving his office to go to the hospital, he first tries to get a cab which is taken by a men with balloons. When he arrives at the hospital, after deciding to run the whole way, the same cab is seen at the entrance and the same man with balloons is getting out.
Barney was hit by a bus because the he only looked to his right, the way of which the bus should have come from (as it's being a one-way road), and not to the left. The fault was actually on the bus.
During Marshall's Miracle flashback about getting his old job back, he claims it was April when he visited Lily's classroom. But the kids are wearing pilgrim costumes and a turkey can be seen on a table, suggesting it's more than likely November, not April.
When Stella realizes Ted broke up with her, Marshall tries to avoid her by pretending to take a call on a pen.