When the Body is placed in Megs car trunk its early morning immediately following waking Kevin. 3 minutes later (episode timeline) Meg Is pulled over in the nighttime, worrying about being caught with evidence in the cars trunk. No scenes indicating time passage,
Real hospital patients get a plastic bracelet with their name and date of birth on it - John doesn't get one during his hospitalization and neither does Kevin when he is hospitalized in a subsequent season. This mistake is quite rampant in TV/movie scenes set in hospitals.