The data is flawed not for this reason alone, but its sufficient to not consider it as useful.

The data is also not useful as box office sales are based on movie hype. Since box office numbers are generated from theater views alone. The highest box office movies will be highly advertised, and more often than not be parts of a series. Take for example Furious 7, which I think is a great movie, but is nothing when compared to something like Wall-E. Furious 7 had a box office of 1.9 Bil^(inflation adjusted) whereas Wall-E made 721 Mil ^(inflation adjusted)