On June 6, 1998, according to my reliable source, the GMA management moved Startalk, a weekly entertainment and talk show, to an earlier Saturday afternoon timeslot. It was placed right after Eat Bulaga!, a noontime variety show. The reason was to get ahead of its rival show, Showbiz Lingo (ABS-CBN). Before this change, Startalk used to air every Sunday.
Somewhere along the way, a seamless patch was introduced between Eat Bulaga! and Startalk. A “seamless patch” is a TV-production term where a show that is about to end transitions directly into the next show without any commercial gap or break in the broadcast. This is done so that viewers watching TV will not even think about switching channels.
This seamless patch is also done in other countries. They use different terms for it like “seamless transition,” “clean feed,” “cold open,” “CM-nuki,” “live hand-off,” or “studio-to-studio switch.”
But of course, we didn’t get left behind when it comes to making this trend our own. At the end of every Saturday edition of Eat Bulaga!, the hosts would appear in a split screen with the hosts of Startalk. Then the late Master Rapper and Eat Bulaga! TV host Francis Magalona (RIP) would shout the line, “Luzon, Visayas, Mindanao… SEAMLESS NA!” as a signal for the transition to the start of Startalk. Because so many people were watching both Eat Bulaga! and Startalk, Filipinos regularly heard this phrase, and it stuck in their minds. Because of that, “SEAMLESS NA!” became part of Pinoy pop culture due to its cultural memory and public recognition.
Based on my intense (and very serious 😄) research, they started popularizing this around 2003. When Francis Magalona passed away on March 6, 2009, the hosts of both TV programs still continued the practice, but around September 2010, they finally stopped doing it.
Here is an example of a seamless patch from the Vzzzz YouTube channel.