Police are hunting for football spectators who set off smoke bombs and made sectarian remarks during Rangers' first competitive match as a newco.
A 23-year-old man has also been arrested for breach of the peace for climbing on to a floodlight.
Police said the majority of the capacity 4,100 support at Glebe Park in Brechin, Angus, conducted themselves "in an entirely appropriate way", and said the game should not be overshadowed by the actions of a minority.
The Brechin City v Rangers match kicked off just days after the Rangers newco was granted a conditional Scottish Football Association (SFA) licence.
Lee McCulloch grabbed an extra-time winner to end the match 2-1 as Rangers were forced to battle for an historic victory in the Ramsdens Cup.
The match was their first competitive outing since the club was consigned to liquidation over the summer and voted into the Irn-Bru Third Division.
Andy Little celebrated his return to the club with the opener after just four minutes but Rangers were forced to negotiate the first round tie the hard way when Andy Jackson levelled for the Second Division hosts just before the interval.
It took 102 minutes of football before McCulloch found the winner to finally allow Rangers to begin a new era on a positive note.
A police spokesman said: "The crowd were in good spirits as the game moved into extra time and the atmosphere was excellent. A minority tried to disrupt the game by setting off smoke bombs, with one person shouting sectarian remarks and another climbing on a floodlight structure.
"A 23-year-old male was arrested for a breach of the peace in relation to the floodlight incident and enquiries are ongoing in conjunction with Strathclyde Police to identify those responsible for the other offences. The actions of the minority should not overshadow the football game that was well attended, well supported, with fans from both sides conducting themselves in an entirely appropriate way."