2'40:1 on retail DVDs when movie is 2'35:1 ?

[Episodio1]

Is there any technical reason to make 2'40:1 DVDs when movie was screened at 2'35:1 ?

Thanks.

[manono]

Because it probably wasn't screened at 2.35:1. More likely it's 2.39:1.
Anamorphic prints are still often called "Scope" or 2.35 by projectionists, cinematographers, and others working in the field, if only by force of habit. 2.39 is in fact what they generally are referring to (unless discussing films using the process between 1958 and 1970), which is itself usually rounded up to 2.40. With the exception of certain specialist and archivist areas, generally 2.35, 2.39, and 2.40 mean the same to most professionals, whether they themselves are even aware of the changes or not.
http://en.wikipedia.org/wiki/Anamorphic