An endless stash of cold Old Style inside a refrigerator hidden behind a secret moving wall in the Cubs’ marketing offices was partially to blame for the errors made on the mural commemorating the club’s 100th anniversary, team officials said.

Front office personnel found a staffer passed out with empty beer cans strewn about during the early hours of a weekend employees were working overtime on a deadline leading up to the centennial celebration of Wrigley Field, leading them to the secret wall and cache of Old Style, according to Cubs Vice President Julian Green.

But too many “creative meetings” in the mysterious room has led to public embarrassment.

The blundered art — including an image of Charles Lindbergh’s 1927 visit to Comiskey Park, not Wrigley Field, as it’s labeled — is displayed on the outer wall of the Cubs’ legendary stadium.

The Cubs intend to fix the errors — but not before doing away with the secret wall, which Green said will be filled with concrete.

Conveniently adjacent to the office restrooms, the moving wall is activated when a dusty Cubs offensive strategy book is removed from a bookshelf, exposing a sophisticated and labyrinthine corridor fit with a refrigerator stocked with beer, as well as cold hot dogs. The secret passageway was apparently constructed in 2004, a result of the infamous Steve Bartman incident that took its toll on Cubs fans worldwide, Green said.

“Our marketing staff has been scarred ever since that monumental atrocity,” Green said. “This was their way of coping.”