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We don't intentionally show ads before each trailer on IMDb. Ads on videos are frequency capped, so you only see the same ad occasionally. If you're seeing the same ad, it could be that an ad or cookie blocking plug-in is interfering with the frequency capping. We recommend disabling any ad blockers and the trailers should work as expected.
We also recommend checking your Amazon Advertising Preferences. If you selected "Do Not Personalize Ads from Amazon for this Internet Browser" this will opt you out of us storing any ad tracking information which may cause the ad or same ad to appear before every video.