After Karin gets up to leave before playing the saraband, the wires from the lights, and the end pins for the cellos are no longer on the floor, despite being there once Karin and Henrik's conversation began.
There are some interesting discrepancies in relation to the time line of the characters. The ages given for the characters are 63 (Marianne), 86 (Johan) and 61 (Henrik). Marianne says that she has not seen Johan for 32 years and that they had been married for 16 years. This means that she married Johan when she was 15 and he was 38. Johan had a falling out with his son when Henrik was 18/19, which must have been after Johan's marriage to Marianne.