The typewriter Rose uses in the shop is an Adler Triumph, a European model which uses the 'AZERTY' keyboard, a popular style used especially among European-based French speakers (as opposed to the English QWERTY). Switzerland and Luxembourg use a variant called 'QWERTZ'.
The movie features a business machines company named "ICM"; they couldn't use "IBM" real name.
The scene where Deborah Francois enters the hotel room wearing a red dress for Romain Duris is a homage to Vertigo.
The golf-ball shaped Selectric element drawn by Louis and shown at the end of the movie was patented by Leon E Palmer of IBM in 1957. Leon was not French, the rounded shaped was indeed his idea, and he even patented 19 other items for the Selectric.
Actor Eddy Mitchell was a singer in the famous band "les Chaussettes Noires". One of the Chaussettes' song, "Dactylo Rock", written by Eddy in 1961, is played during the movie. Its lyrics follow the movie's theme.