When Santa returns to the North Pole after his fall, the elves erase a board saying that it's been 10,228 days accident free. That works out to 28 years, the amount of time that had elapsed since Scott took over as Santa. However, the first episode takes place over the course of a year; it starts when Scott has already been Santa for 28 years and ends when he's been Santa for 29 years. Whoever was responsible for writing the sign on set forgot to account for that extra year.
Cal's letterman jacket has a snowflake on the chest, however, the snowflake has 8 points. Snowflakes have 6 points.