A Reaper in Father’s Day (2005).
The Doctor (Matt Smith) and River Song (Alex Kingston) in The Wedding of River Song (2011).
It’s inevitable that a series about time travel is going to have continuity errors. Indeed, it could be argued that stories where the Doctor has to prevent established history from being changed, such as City of Death (1979) and The Fires of Pompeii (2008), are all about the peril of continuity errors, while episodes like Father’s Day (2005), The Big Bang (2010) and The Wedding of River Song (2011) are all about what happens if continuity is ‘broken’.