Hot Wheels Easter Eggs
My Dodge Viper. Does not say what it is on the bottom, or what year it is, but the sides do.
The latests green Volvo wagon has 2 dogs looking out the back window.
Mainline Volvo 240 drift wagon '24 
- Very cool. I just had to go grab mine to check because I haven't opened it, yet. — LobotomyScam
My Surf 'n Turf has a Flying V electric guitar on the back seat.
The MBX Chevy Blazer 4x4 has what looks like two swords in the back (might be a little hard to see), and the Pontiac Aztek Custom has a hat and sunglasses in the back.
- That's a reference to the show "Breaking Bad." Nice touch. — LobotomyScam
- Which one is? — ManiacMotorsports
- Aztec. — LobotomyScam
- ah — ManiacMotorsports
so i strip down cars and polish them up just for something to do, i found these on the premium bmw m3 (e46), not something i seen on anything else, i'll hit the caliper with a red sharpie before screwing them back together, it sorta pops through the rim depending on what style wheel i put back on, i know this forum is more about going fast and speed rather than brakes... but
oh yea, all the pedals are there too 
- I have one of those, too. Haven't taken it apart though. One of my favorites! — ManiacMotorsports
Mighty K has a skateboard and spare tire in the back.
just found this today K.I.T.T. has what apears to be a roof consol full of controls, the window peice has a cutout to go around it, but if it were still together its un-noticeable 
This '70 Firebird casting has 'Scum Bum' on the tail panel, which is a reference to Smokey and the Bandit, specifically the edited version of Sheriff Buford T. Justice's go-to epithet 'SUMBITCH!'
What I don't know is why this is on a '70 instead of a '77 casting, which Hot Wheels has two different versions of, or why they didn't put Scum Bum on any of the recolors.
hidden engine detail in a hot wheels premium alfa romeo gtv6 3.0, most likely in the mainline version as well
The newest casting in the "Project Speeder" variants is the (Mod Speeder-HKG59). It has not one but two dogs in the backseat. Possibly the puppy of the big dog. Both are curled up.
The Hot Wheels 55 Panel Van has what appears to be speakers in the very back, along with a couple other items I cannot identify (speaker amps?) closer to the cab.
The Hot Wheels A-Team Van has third row seating - but of course. I pity the fool who didn't expect that.
The Hot Wheels 70's Van (yes, I like vans) has some cargo in back.
and finally, the mbx Vista Cruiser has - not just 2 dogs - but also some other cargo in the back. Looks like a cooler, a couple of duffel bags, and some other shtuff.