An easy visible mistake is a player set as starter AND as entering substitution. After entering subs there is the outgoing player listed in brackets. So, actually you shouldn't see these brackets after any starter. If it does, it means the same player is listed as starter, too. Example:
In this case Alsény Agogo Camara is set twice as starter and as entering sub. His namesake Alsény Cantona Camara was the starter, source and see team pic below:
Besides namesakes, another frequent mistake can be changing the order of incoming and outgoing substitute player, so the starter (and outgoing player) is set by mistake as entering player, too which creates also the brackets with the wrongly suposed to be exchanged player.
So, whenever you see such brackets after a starting player, you know there is a mistake.
How to spot a mistake
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Here's a good one:
So I believe Myojin, Santos, Ichikawa and Ogasawara are the starters here... and according to Transfermarkt there were 7 substitutions for Japan:
26th: Hiroaki Morishima for Ogasawara / 29th: Akinori Nishizawa for Yanagisawa / 46th: Takashi Fukunishi for Ichikawa / 80th: Toshihiro Hattori for Santos / 81st: Yashuhiro Hato for Myojin / 82nd: Shunsuke Nakamura for Miyamoto / 87th: Tatsuhiko Kubo for Suzuki.
Here's another:
Got a double up here with Ala-a Al-Sasi coming off twice and a quadruple up with Muath Assag coming off 4 times!
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Oman Yemen was a strange one. I've never 100% believed the report that I read which has al Sasi subbed by Hanash , who in turn was subbed by Khaled Baleid, who was later subbed by Kamel Tarek.
