It is supposed to be the middle of the night when Virgil sets off in Thunderbird 2 for Coralville Hospital, but the Thunderbird 2 launch takes place in full daylight (the regular Thunderbird 2 launch sequence being used in this case).
In one scene, Tin-Tin tears off a calendar which shows the date as 2026. All the calendars in this episode indicate that Christmas day falls on a Sunday (see the Trivia section for more details), but 25 December 2026 will be a Friday.
Update: Also, if the year was 2066 (as the creators claim), the day of the week Christmas falls on would still be incorrect. Christmas of 2066 occurs on a Saturday (not Sunday).
Update: Also, if the year was 2066 (as the creators claim), the day of the week Christmas falls on would still be incorrect. Christmas of 2066 occurs on a Saturday (not Sunday).