being the first duet, it is also Finn and Rachel's first duet. While the rest provide background vocals.

The gang, after shooting their coverage, were behaving so terribly that they got yelled at for the first time. Source

This version of the song was both the first and the last song revealed to be on the show.

The song has sold over 1,422,000 digital downloads in the US, making it the largest-selling Glee song of all time.

It also debuted and peaked at #4 on the US Billboard Hot 100 and #2 on the UK Singles Chart, making it the most successful Glee song of all time.

Errors

When Rachel sings the line "He took the midnight train going anywhere" and lifts her arm up, her palm is facing downward; in the next shot,engine that equalizes the fuel to air ratio in all cylinders such that all cylinders reach a peak EGT at a common total engine fuel flow rate. Such a method would compensate for the variation caused by inherent engine conditions of construction such as occult fuel transfer and unbalanced combustion air, as well as fuel injector variation.