Mozart died on December 5th 1791. Records show that he was sealed in a wooden coffin and buried in a plot along with 4 - 5 other people; a wooden marker was used to identify the grave. Although this is the kind of burial modern readers may associate with poverty, it was actually the standard practice for middle income families of the time. The burial of groups of people in one grave was organised and dignified, differing greatly from the images of large open pits now synonymous with the term 'mass grave'. Mozart may not have died rich, indeed he may have been relatively poor, but friends and admirers came to his widow's aid, helping her pay debts and funeral costs. Large graveside gatherings and grand funerals were discouraged in Vienna during this period, hence Mozart's simple burial, but a church service was certainly held in his honour.
At this point, Mozart had a grave; however, at some stage during the next 5 - 15 years 'his' plot was dug up to make room for more burials. The bones were re-interred, possibly having been crushed to reduce their size; consequently, the position of Mozart's grave was lost. Again, modern readers may associate this activity with the treatment of pauper's graves, but it was common practice.Some historians have suggested that the story of Mozart's 'paupers' burial was first encouraged, if not partly started, by the composer's widow, Constanze, who used the tale to provoke public interest in her husband's work, and her own performances of it.
Just to clear things up...

I hate that people actually
believe the film