[edit] Major errors

These errors prevent parts of the unmodified board from working.

Connect P[15:8] instead of P[7:0] on the video decoder chip U21
The installed IR detectors do not work. This is not a PCB problem and it can be solved by replacing the IR detector module with one from another source.
The MIDI optoisolator is not suitable. Replace it with a 6N138S/6N138_X007 and lower R54 to 120 ohms. Connect pin 8 to 3.3V and leave pin 7 unconnected.
For USB to work reliably, 15K pull down resistors must be installed on the D+ and D- lines of each USB port (between the 24 ohm resistors and the ports). Add the possibility to make them pull-up resistors to 3.3V (i.e. add placeholders for pull-ups) so the USB ports could work in device mode with a small PCB modification.

[edit] Minor errors and improvements

These errors do not alter the functionality of the board.

Add 1K pull-down resistor on ETH_RESET_N (specification says reset should be low during power-up)
Add 1K pull-down resistor on VIDEOIN_RESET_N (the application schematics includes external POR circuitry)
Add notch to mark pin 1 of J3 on silkscreen
Use red, green and blue connectors for J18
We might want a larger soldered area under the pads of U10
Indicate "+/- 5%" and pinout (positive in the middle) near J11 on silkscreen
Add a 5V supply pin on the GPIO expansion header
Add a test point at the output of the MIDI optoisolator
Add test points on the USB signals (3.3V FPGA side: VP, VM, RCV, OE)
To reduce audio output noise, power the LM4550 analog supply through an additional TPS76301 set to 4.3V.
In order to be able to detect board revisions, route 4 FPGA I/O pins to placeholders for 0402 pull-up resistors. The combination of placed and non-placed resistors encodes the board revision. The RC2 board should be encoded as 0001 (ie place only 1 resistor) to distinguish it from RC1 which does not have any resistor.