Coventry assistant Steve Harrison and Cardiff manager Dave Jones agreed the last-gasp penalty that led to a 2-1 win for the Bluebirds was harsh.
Peter Whittingham's cross was adjudged to have hit the unraised arm of Sky Blues full-back Martin Cranie although there was only a matter of yards separating the pair.
Referee Simon Hooper failed to point to the spot initially but was convinced to do so upon seeing the flag of his assistant.
A disappointed Harrison said: "From the bench, we obviously thought it was harsh. If I'm proved wrong then I'm wrong but I thought he played it against him from possibly three feet away. I haven't seen it on a replay, though, and until I see it we can't really say. But we thought it was a harsh decision."
Boss Nigel Clough felt a touch of naivety cost Derby victory against 10-man Middlesbrough.
County conceded a needless free-kick on the left and Barry Robson's inswinging cross was glanced home by the head of substitute Leroy Lita to rescue a 2-2 draw for the Teessiders.
Clough said: "It feels like two points lost because of the timing of Middlesbrough's equaliser. But it's part of the learning process and we have to see games out better than that. There was an element of naivety at times. We went for another goal when we didn't need one and people have got to do their jobs defensively a little bit better."
Referee Roger East's penalty decision was the topic of debate after West Brom won 2-0 at promotion rivals Swansea to move within a point of the Coca-Cola Championship summit.
Baggies boss Roberto Di Matteo said on the incident: "It was a clear penalty as Giles Barnes had put the ball beyond the defender before being brought down."
Bristol City boss Gary Johnson was devastated to lose out on a point after Carl Fletcher's 90th-minute strike cancelled out Nicky Maynard's first two goals of 2010 in a 3-2 defeat to Plymouth at Home Park.
Johnson rued: "It was a soul destroying way to lose really, especially after we had got back into it. We have done it again and given away another late goal but we didn't start that well, so that was disappointing."
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