 When PBS began re-airing the first 460 color episodes of the series in 1976, some of the earliest color episodes from 1969 and 1970 were re-edited with new voice-overs or footage.For example, in one 1970 episode where Mister Rogers demonstrates the noise-proof ear protectors that airport workers use on the tarmac, the film footage used featured a worker directing a United Airlines jet with its stylized "U" logo—which was not introduced until 1974.All of the episodes revised from the first series also included an extra segment following the closing credits, mentioning the episode number and additional companies that provided funding since these episodes originally aired, even though they had not provided funding at the time of original production.