For Allu Arjun any film that has "R" in the middle of its name, it is a habit to spell it in English with two "R"s.
He did the same for Sarrainodu as Race Gurram worked out for him. It could just be a spelling mistake that no one tried to correct and that might have become a sentiment.
He did use such for Naa Peru Surya but for AVPL, we see it is being followed. Ala Vaikuntapurambu Lo is the correct form of usage as per the Telugu poem by Pothana.
But for the film, the team used Ala Vaikuntapurramuloo. This doesn't seem like a spelling mistake with Trivikram around. So, probably the extra "R" and "O" are to not let number gods of numerology down and bring the possible luck that they can bring to the film!
Movie has Pooja Hegde, Nivetha Pethuraj, Sushanth, Sunil, Tabu, Harshavardhan, Jayaram, Samuthirakani, Rajendra Prasad, Sachin Khedkar, Rohini, Murli Sharma as the main cast apart from Allu Arjun in the film. SS Thaman's audio is already a super success and Geetha Arts, Haarika & Hassine Creations are bankrolling this 12th January, 2020 release.