There are two more in the most recent update being rolled out now - the first, which works in the Model S and Model X, turns your sat nav screen into a view of Mars. It won't actually take you to the Red Planet, but you can at least pretend you're driving across it.
To activate the hidden feature, enter "Mars" into the destination zip code field. The view pans accordingly as you drive, but make sure you keep your eyes on the road.
Lights, sound, action
The second Egg is for Model X owners only. Press the Tesla icon at the top of the in-car display for five seconds, and then when a password screen pops up enter "Holiday".
Exit your Model X, lock the doors, and the car starts playing music alongside its very own light show. Based on the videos we've seen it's pretty impressive but make sure there's enough clearance for the doors to open and check there are no sleeping babies nearby.
Musk also took to Twitter to announce that upgraded Autopilot performance should be reaching cars by the end of next week, just in time for 2017. Tesla had previous promised the update would launch sometime in December.
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Dave is a freelance tech journalist who has been writing about gadgets, apps and the web for more than two decades. Based out of Stockport, England, on TechRadar you'll find him covering news, features and reviews, particularly for phones, tablets and wearables. Working to ensure our breaking news coverage is the best in the business over weekends, David also has bylines at Gizmodo, T3, PopSci and a few other places besides, as well as being many years editing the likes of PC Explorer and The Hardware Handbook.