What Errors are in US Proof Sets?

I picked up these from a collection recently. I know they are common sets, but I've heard there can be errors on certain sets? RPMs, etc. Any advice appreciated.

 

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Check the 1970 set for the Lincoln cent small date.

 

Highly unlikely, but I guess you could check for the 1968 no S dime? Or the 1971 no S nickel? Hope springs eternal

 

‘68 no S 10¢
‘68 Inverted S mm 50¢
‘68 RPM 5¢
‘70 no S 10¢
‘71 no S 5¢
‘71 DDO 1¢

 

Look carefully and use your red book to help determine varieties and errors.

 

Hard to believe but I was just reading in the 1968 dimes. And I think I got it right it is not an S but a few little flaws.

 

You’re getting better at this girl!

 

So I have a 1969 San Francisco proof set sealed - dime, quarter and one of the Pennie’s lack the “s” but the “s” is on the second penny and nickel. Thoughts?

 

There are a few variety sites to check. Ie Coppercoins, variety Vista, wexler files, coneca ...as for errors there can be anything - in theory - such as clashes and strike throughs.

 

That's a Mint Set, not a Proof Set

 

It’s a normal Mint set. Not a proof in the least.