A HOT WHEELS ERROR IS A TRUE RARITY!!! THEY COME IN ALL TYPES. SOME ARE WORTH A FEW DOLLARS AND SOME AS MUCH OR MORE THAN A HUNDRED DOLLARS!!! SOME EXTREMELY RARE ERRORS ARE WORTH SEVERAL HUNDRED DOLLARS TO A $1,000!!! IMPORTANT TIP: USE THE KEYWORDS: HOT WHEELS ERROR TO SEARCH ON EBAY, THIS WILL SHOW ALL THE HOT WHEELS ERRORS ON EBAY. THE BEST WAY TO SPOT A ERROR IS TO LOOK FOR SOMETHING DIFFERENT ON A CAR LIKE A MISSING PART: ENGINE, WINDSHIELD, INTERIOR OR WHEELS. ONE VERY RARE ERROR IS IF A CAR IS MISSING ANY OR ALL OF IT'S TAMPO PRINTING WHICH IS THE NAME FOR THE PROCESS THAT PUTS FLAMES, DESIGNS, DECORATIONS ON A VEHICLE!!! ONE EXTREMELY VERY RARE ERROR IS WHEN ASSEMBLED, THE RIVETS WERE NEVER PINCHED OR THE CHASSIS/BASE IS RIVETED ON BACKWARDS!!! THERE ARE SEVERAL WHEEL TYPE ERRORS SUCH AS TWO DIFFERENT RIMS, WHEELS THAT ARE THE WRONG SIZE EITHER SMALL OR LARGE. ONE DEFINITE FACTOR IS IF YOU HAVE A VERY POPULAR VEHICLE WITH A ERROR SUCH AS FOR INSTANCE THE '67 CAMARO, IT IS MUCH MORE VALUABLE BECAUSE IT IS MORE COLLECTED AND SOUGHT AFTER THAN OTHER HOT WHEELS CARS!!! IMPORTANT TIP: A ERROR ON THE HOT WHEELS VEHICLE ITSELF IS MUCH MORE RARE THAN JUST A PACKAGING ERROR LIKE VEHICLE UPSIDE DOWN, WRONG NAME OF CAR ON PACKAGE, ETC. THERE ARE FIVE BASIC GROUPS OF ERRORS: #1) MISSING PART #2) WHEEL ERROR #3) TAMPO PRINT ERROR #4) ASSEMBLY ERROR #5) PACKAGING ERROR. ERROR VALUES VARY FROM ONE COLLECTOR TO ANOTHER, AND AS A RESULT IT IS VERY HARD TO BE SPECIFIC ON EXACT VALUES, SOME ERRORS ARE DEFINETLY MORE RARE THAN OTHERS. MOST ERRORS ARE NOT ONE OF A KIND AND THEIR IS USUALLY A VERY SMALL QUANTITY OF THEM OUT THERE. EVEN IF THERE WAS SEVERAL HUNDRED OR EVEN UP TO A THOUSAND OF A ERROR THAT STILL MAKES IT VERY RARE WHEN YOU COMPARE TO ABOUT A MILLION OR MORE THAT WERE MADE OF THE SAME CAR WITHOUT THE ERROR. THERE ARE VERY FEW ONE OF A KIND ERRORS OUT THERE, THEY DO EXIST BUT ARE VERY HARD TO COME BY AND NOT ALLWAYS EASY TO VERIFY. THE BEST ADVICE IS TO REMEMBER & KNOW THESE IMPORTANT FACTS THAT I POINTED OUT!!! THERE ARE SOME HOT WHEELS COLLECTORS THAT THINK ERRORS ARE OF LITTLE OR NO VALUE, WHICH IS VERY FAR FROM THE TRUTH!!! THIS IS USUALLY BECAUSE THEY DO NOT COLLECT THEM AND DON'T REALLY KNOW OR CONSIDER THEM OF ANY VALUE!!! SERIOUS HOT WHEELS COLLECTORS KNOW ERRORS ARE MOST DEFINITELEY WORTH SOMETHING, BECAUSE THEY DO SELL FOR MODERATE TO HIGH PRICES REGULARLY ON EBAY!!! HOT WHEELS ERRORS WERE NOT SUPPOSE TO HAPPEN AND AS A RESULT THEY ARE MUCH HARDER TO FIND AS THE PACKAGE NEVER INDICATES ANYTHING AT ALL ABOUT IT BEING A ERROR. YOU REALLY HAVE TO BE GOOD AT MEMORY SKILLS & KNOWING THE WAY ANY HOT WHEELS CAR IS NORMALLY ISSUED TO USUALLY SPOT THE ERROR!!! HOT WHEELS ERRORS ARE MUCH MORE RARE THAN MOST TREASURE HUNTS!!! BECAUSE THERE ARE A LOT LESS HOT WHEELS ERROR'S OUT THERE!!!  HOT WHEELS ERROR'S WERE NOT SUPPOSE TO HAPPEN!!! JUST THINK ABOUT IT A TREASURE HUNT ALLWAYS HAS THE WORDS "TREASURE HUNT" RIGHT ON THE PACKAGE SO THEY ARE EASILY IDENTIFIED, BUT ERRORS NEVER DO AND THAT MAKES THEM MUCH MORE OF A CHALLENGE!!! AND MUCH MORE RARE!!!