Stephen420,
Sure, it can be considered an "error" if you take an "error" to be defined as any coin having an appearance even slightly different from the intended appearance of the coin. However, in my mind "errors" are coins which obviously should have not passed quality control at the Mint. I tend to think in 1937 this small lamination would pass unnoticed; and even if discovered by the Mint, it would not be pulled, like a very slightly off-center coin.
USArmyParatrooper,
As I said before, a purist may not like it. I believe there are enough regular folks that will appreciate the "war paint" and will not be put off by it. Collecting coins is a fun hobby, and these things make it fun. Investors don't understand this.