Lohan will make a guest appearance as herself in the third season finale, but angered some of the show's cast by throwing off a day's schedule with her late arrival, TMZ reports.
Dot Marie Jones, who plays Coach Beiste, tweeted: "Gonna be a long day!! Some ppl show up late and just throw a wrench in things. Not cool! I'd rather be an hour early (I was) than 5 minutes late!"
The tweet has since been deleted, but the latecomer in question has reportedly been confirmed as Lohan.
Another source connected to the production, however, claimed that Lohan nailed her dialogue during the scenes she has already filmed, and was very polite to cast and crew.
The episode's director Eric Stoltz has called her "very professional".
It was also suggested that Lohan was only on set on the day in question to shoot reaction shots, and thus her late arrival did not delay production.
Cory Monteith said recently that he is "excited" for Lohan's guest spot on the show.
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Watch the promo for Glee's next episode 'Choke' below: