The ones for the new (3rd release) of the Firefly are particularly bad. Dragon has taken the instruction sheet from the 2nd (1st??) release and tried to update it for the 3rd release. There were many parts retooled for the new release, but often, the old part numbers are called out. It's really confusing. If you seem to be missing a part, look for the same number on a different sprue. As I recall, many of them are on sprue V. Also, there are some parts that mount on the side of the hull behind the bolsters that aren't even mentioned in the instructions. They change the mounting slots for the bolsters to round holes. They aren't too hard to figure out, if you know they are there.
One other "gotcha" is the way they show the bolt strip between the lower hull front and the transmission cover. It should be relatively flush with both of them. Every Firefly model I've seen done with this kit, including mine, have it at an angle, sloped between the two pieces. I think it results from the piece being drawn basically backwards in the instructions. I'll post a couple of pictures of how one should look and how mine came out. Good luck.
Bill
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DML M4A2 Red Army
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-- There is a fine line between "hobby" and "mental illness". (Author unknown)