Here is the Lua code with additional debug comments to print out the messages that have already been captured and displayed in the output window:
```lua
-- Create a new output window with a given name
local outputWindow = createTextWindow("Game Communications", "Consolas", 12, 0, 0, 400, 300)

-- Define a function to capture all game communications and display them in the output window
function captureGameCommunications(event, message)
  if event == "comm" then
    -- Get the current time and format it as a timestamp string
    local time = os.date("%H:%M:%S")
    -- Append the timestamp and incoming message to the output window
    cecho(outputWindow, "<white>" .. time .. " " .. message .. "\n")
    -- Print debug comment with the message that was just displayed
    print("Message displayed: " .. time .. " " .. message)
  end
end

-- Register the function to capture game communications
registerAnonymousEventHandler("comm", "captureGameCommunications")

-- Print debug comments for all messages currently in the output window
for line in gsplit(getWindowText(outputWindow), "\n") do
  print("Previous message: " .. line)
end

-- Print a final debug comment
print("All messages have been printed from the output window.")
```
Here, additional debug comments are added using the print function to print out the messages that have already been captured and displayed in the output window. A for loop goes through all lines in the output window text and prints a debug comment for each line. A final print statement is added at the end. Please let me know if you have any other questions!
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