[4] While running the line at the 1993 Toulon Tournament, Dallas stopped a match between Czechoslovakia and Portugal after spotting a serious injury to Czech player Martin Svedik.
Dallas was credited with saving the player's life and thanked by Ivan Kopecky, the coach of the Czech team, for his intervention.
[6][7] In June 1997, Dallas refereed an important 1998 FIFA World Cup qualification match between Spain and the Czech Republic.
[8] UEFA offered Dallas police protection[9] after he awarded Italy a late penalty in their 2–1 win over Turkey at Euro 2000.
[16] The crowd pelted Dallas with missiles including coins, fruit, bottles and cigarette lighters[17][18] as he left the field under police protection.
[21] Play was later stopped for several minutes while Dallas received treatment after being hit on the head by a coin thrown by a Celtic supporter.
Early in the second half, he declined to award a penalty kick to the USA after a shot by Gregg Berhalter was blocked on the goalline by the outstretched arm of defender Torsten Frings.
Dallas defended his decision on the grounds that Frings did not intend to handle the ball, commenting "If it's not intentional it's not a foul, no matter where it is.
"[29] In the same match Dallas cautioned Oliver Neuville for a foul committed by his teammate Jens Jeremies, having mistaken their identities.
[32] According to Dallas, the Brazilian players insisted he join them following their celebratory team huddle dance around the World Cup trophy.
Dallas himself had initially publicly repeated McDonald's false version of events[37] but denied allegations of "bullying and harassment".
[41] After journalist Phil Mac Giolla Bhain had broken the story,[42] the SFA issued a statement on 10 November stating that an investigation would be carried out.
[43] On 24 November, the Roman Catholic Church in Scotland wrote to the SFA demanding that they remove Dallas from his position if the allegation was proved.
In November 2014, he criticised the arbitration of Ilias Spathas (one of the many refs involved in the 2015 Greek football scandal), after a match of Olympiakos, as the "worst he has ever seen" saying that the mistakes were not normal.
In the interview, he also added that after every match, he talks to the referees and makes video calls and creates online meetings for their development.
"[54] Yankaya, would also go on to state that he had made a mistake by giving a penalty and also said that when Bitigen said he didn't see the position, he felt to need to analyse it, adding that he was still questioning why he did what he did.
[56] Dallas was appointed Member of the Most Excellent Order of the British Empire (MBE) in the 2003 New Year Honours for services to football.