Use the film’s full title, release year and a recognisable cast or director credit. Then look at language and edition details. A shared poster or title does not establish that two catalogue entries contain the same production or edit.
Identify the production first
Short titles are often reused, and a remake can resemble the original closely in search results. Add the production year or a lead performer when the title alone produces several plausible matches. Alternative release titles also matter for imported films. A film remembered by its domestic title may appear under an English marketing name without being a different work.
Treat duration as a clue
A television slot, catalogue running time and cinema running time measure different things. Advertising and introductions can make a scheduled slot longer; edits and credits can make versions differ. Small rounding differences are common. If you need a particular cut, ask for that edition directly instead of assuming that the longest number always identifies it.
Match the viewing language
The country of production does not guarantee a particular audio track or subtitle language. A localised catalogue title may lead to original-language audio, while an original title can appear on a dubbed copy. Look for the options on the actual programme entry. If a language is essential, it belongs in the viewing enquiry before a purchase decision.