The Famicom version of Contra was better - Retrogaming Easter Eggs
The NES version of Contra lacked a lot of the cool features that the Japanese Famicom version boasted. An introductory sequence! Story events after levels! Additional sounds! MAPS!
But the Famicom version also had a level select code. After choosing your game mode and hitting START, hold UP, LEFT, SELECT, and A. The screen will fade into a level select screen.
ALSO exclusive to the Japanese version was a sound test. On the title screen hold A and B and press START. This brings up the sound test, which has at least two tracks that aren't featured in the NES version.
Thanks to The Cutting Room Floor for the information - https://tcrf.net/Contra_(NES)
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