some lil things i found out about goodfellas
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Factual error: In one scene we are introduced to Idlewild Airport in 1963. We're shown a couple of aircraft in flight and one of the aircraft is a Boeing 747 in the livery of KLM Royal Dutch Airlines. The Boeing 747 didn't enter commercial service until 1969.
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Revealing: In the scene where Karen is too afraid to accept free clothes from Jimmy and speeds off, the yellow NY state license plate falls from the parked car to reveal the modern white one underneath.
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Continuity: When Henry Hill is in jail and talking with his wife, the child is playing with a stack of coloured toy blocks. The order the blocks are stacked in change in different shots.
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Continuity: The scene in the restaurant where Joe Pesci messes with Ray Liotta saying, "What, am I funny, am I a funny guy to you?" watch the drinking glasses on the table. The drink levels are going up and down with and then without ice.
When Henry is being followed by the helicopter, he almost slams into another car. Henry's car has a brake light in the back window, but they didn't start that until the mid 80's at the earliest.

When Maury jumps into the pool in his wig commercial, his head presumably goes underwater, but when the next shot shows him standing in the pool, his wig is dry. [Of course it is. It's a commercial - he is showing how water resistant his ridiculous wigs are by putting a dry one on for his close up shots. It's called advertising.]
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In the scene where Tommy shoots Spider in the foot we hear 7 gunshots from what appears to be a 6 shot .38 revolver. [Tommy is shooting a 1911 colt 45 pause the scene its a semi-auto 45 not a revolver.]
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In the scene where the guys go to Florida to "feed the guy to the lions," the lion first shown is a male with a huge mane. When seen upside down the 1st time it's the male, but the second time it's a female, no mane, slightly smaller, lion. They never show more than 1 lion in the pen, either. [Like they say, they are feeding him to the lions (plural). Just because we never see more than one lion at the time, it does not mean there are not two (or more) of them. We never get to see the entire lion's pen, so the others could have been just off screen.]
1st scene when Ray Liotta has grown up and he is front of the impala in the year 1963 at Ldylwind airport. A large plane goes over his head and if you look at the plane its a boeing 747. The problem is that the first boeing 747 to fly was in February 9 1969.
During the early scene where DeNerio & Pesci hijack the truck. you can see modern day graffiti\tag
In the scene where Jimmy and Henry are trying to get the money owed to them from Maury (The Wig Guy). Jimmy is beating Maury with the phone, and while the phone is off the hook, it rings.
Spider, with his foot in a cast, is being taunted by Tommy. At this point he is standing behind a bar. Yet when Tommy shoots him dead, he has suddenly swithched to the middle of the floor, several feet in front of the bar.
In the scene where Karen pulls the gun on the sleeping Henry Hill the gun changes model numbers multiple times.
As the camera pans and changes from front to rear view the gun changes from a blue steel Model 36 to a stainless steel model 60.
The tip off was on the close up of the hammer. A model 36 is case hardened (a blue merle in color) where as the Model 60 has a stainless (silver color) hammer.
Joe Pesci shoots Spider in the foot. Ray Liotta gets up to help Spider. A couple other guys join Liotta as they carry Spider off to the emergency room. Liotta is helping the limping Spider, and in the next cut, Liotta is magically back at the poker table!
When they re-show Joe Pesci shooting Sam Jackson the blood is already on the wall in the background
When Henry picks up Karen for their second date, Henry was dressed up casualy and was Karen (she had some kind of pink dress with flowers or something). In the next scene when they got out of the car, Henry had a dark suit and a tie and Karen was dressed in a black dress