I'd venture to suggest that you might have misread the host's words, or he himself may have an inaccurate understanding of the "-(e)d" sound at the end of a word. Actually it cannot be omitted, as other answers have said, but is often realized as "unaspirated" (when proceding a consonant), just the same as the "t" sound in Cantonese words "baat (eight)" and "faat (hair)" (I noticed you're from Hongkong). That is to say, you do make the "t" sound but only hold the air in your mouth before you let it go at the end of the articultion (, and do not let it off so strong that you may hear the sound of the turbulence).