The employee, acting on the fact that Spielberg was blacklisted by the Arab League's Central Boycott Office in 2006, covered the movie maker's name at the weekend on posters advertising the film, a theater official told AFP on Thursday.
But once word and pictures of the censored posters got out, theater officials immediately removed the tape placed over Spielberg's name, he added.
"This was a mistake made by an overzealous employee," said Bassam Eid, theatre coordinator for Circuit Empire, which operates a chain of cinemas in Lebanon.
"He knew that Spielberg was blacklisted and he took it upon himself to black out his name," he added, pointing out that the incident concerned only one theater.
Spielberg was blacklisted by the Arab League after he donated $1 million to Israel during the 2006 war between the Jewish state and Lebanon.
An official at General Security, which handles censorship matters in Lebanon, said that while technically Spielberg's film should be banned in Lebanon, that would be futile considering new technology and the wide availability of movies on the local black market.