Pieta

Not so clearly. Boojam has right. If she puts it on her table, so why the cup disappears? We have three different shots at the kings table after that, and there's no cup. It's gone. We see this. Fourth shot is when Tyrion is taking it, and it's nearly sure, that the cup is returning to the kings table. Maybe Margaery decide to move the cup on the Tyrell's table? And when Tyrion goes to take it, somebody (Olenna, guard or some servant) helps him putting down the cup closer to him. We don't see this. If it's true, everything is correct. No directing errors, and Olenna is a poisoner.

There is a fail of the director episode or some kind of magic because the cup is disappear for a moment. Here we can see where the cup will be placing. We have two plates, one with yellow fruits (apricots?) and one with some mixed dried fruits. There is a sword sheath too. Joffrey's taking the sword, and we see other stuff on the kings table. Margaery cup with wine, and some big, red pillow. Margaery trying put off the cup between two plates with fruits. Now we going to cut the pie. We see red pillow, Margaery cup, two plates... and where is the cup? One second later we see whole kings table. Still no cup. Tyrion is looking for. Where it is? Here it is.Magic cup. Near plate with dried fruits, and sword sheath. Or maybe on the another table, just perspective lying? On this table? Where he found it?