Martin Scorsese Knows About That Continuity Error in 'Goodfellas' — in Fact, He Left It in on Purpose
In an interview with Martin Scorsese's editor, Thelma Schoonmaker, she explains the reasoning behind keeping that error in Goodfellas.

You don't become one of the seminal filmmakers of cinema history without breaking a few rules. One of the original voices of the maverick New Hollywood movement in the 1970s, Martin Scorsesemaintained his autonomous and sometimes rebellious streak even when he was fully immersed in the mainstream. As an artist, his most radical sensibilities come in the integral but often overlooked editing room.